| Rank | Year | Team | W | L | T | PF | PA | EWP | EWPN |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1921 | Iowa | 6 | 0 | 0 | 133 | 22 | 0.946 | 87.89 |
| 2 | 1922 | Iowa | 6 | 0 | 0 | 147 | 33 | 0.938 | 87.34 |
| 3 | 1960 | Iowa | 8 | 1 | 0 | 234 | 108 | 0.933 | 88.25 |
| 4 | 1958 | Iowa | 8 | 1 | 1 | 272 | 146 | 0.928 | 89.83 |
| 5 | 1957 | Iowa | 7 | 1 | 1 | 263 | 112 | 0.904 | 87.95 |
| 6 | 1956 | Iowa | 8 | 1 | 0 | 185 | 84 | 0.903 | 87.44 |
| 7 | 1905 | Iowa | 4 | 2 | 0 | 125 | 81 | 0.894 | 84.62 |
| 8 | 1933 | Iowa | 4 | 3 | 0 | 93 | 56 | 0.889 | 85.95 |
| 9 | 1899 | Iowa | 4 | 0 | 1 | 119 | 5 | 0.873 | 85.62 |
| 10 | 1985 | Iowa | 10 | 2 | 0 | 440 | 187 | 0.855 | 86.21 |
| 11 | 2002 | Iowa | 11 | 2 | 0 | 484 | 256 | 0.850 | 86.05 |
| 12 | 1919 | Iowa | 4 | 2 | 0 | 64 | 31 | 0.844 | 82.77 |
| 13 | 1918 | Iowa | 3 | 2 | 0 | 41 | 36 | 0.840 | 80.51 |
| 14 | 1954 | Iowa | 5 | 4 | 0 | 192 | 141 | 0.835 | 83.69 |
| 15 | 2019 | Iowa | 10 | 3 | 0 | 335 | 182 | 0.833 | 84.97 |
| 16 | 1953 | Iowa | 5 | 3 | 1 | 187 | 91 | 0.831 | 84.21 |
| 17 | 1946 | Iowa | 4 | 4 | 0 | 90 | 92 | 0.819 | 81.96 |
| 18 | 1912 | Iowa | 2 | 3 | 0 | 64 | 131 | 0.816 | 81.66 |
| 19 | 2003 | Iowa | 10 | 3 | 0 | 372 | 210 | 0.815 | 84.30 |
| 20 | 1991 | Iowa | 10 | 1 | 1 | 343 | 179 | 0.813 | 83.40 |
| 21 | 2004 | Iowa | 10 | 2 | 0 | 292 | 211 | 0.795 | 83.22 |
| 22 | 2015 | Iowa | 12 | 2 | 0 | 433 | 285 | 0.792 | 82.29 |
| 23 | 1935 | Iowa | 2 | 2 | 2 | 49 | 37 | 0.791 | 81.04 |
| 24 | 1924 | Iowa | 3 | 1 | 1 | 43 | 45 | 0.788 | 80.17 |
| 25 | 1928 | Iowa | 3 | 2 | 0 | 41 | 36 | 0.788 | 80.48 |
| 26 | 2009 | Iowa | 10 | 2 | 0 | 284 | 184 | 0.788 | 82.14 |
| 27 | 1996 | Iowa | 9 | 3 | 0 | 339 | 243 | 0.784 | 81.87 |
| 28 | 1939 | Iowa | 5 | 1 | 1 | 89 | 91 | 0.781 | 80.98 |
| 29 | 1983 | Iowa | 9 | 3 | 0 | 380 | 189 | 0.780 | 82.10 |
| 30 | 2018 | Iowa | 9 | 4 | 0 | 405 | 231 | 0.778 | 81.93 |
| 31 | 1929 | Iowa | 2 | 2 | 2 | 36 | 28 | 0.777 | 79.34 |
| 32 | 2017 | Iowa | 8 | 5 | 0 | 367 | 259 | 0.775 | 81.51 |
| 33 | 1990 | Iowa | 8 | 4 | 0 | 427 | 288 | 0.774 | 81.40 |
| 34 | 1959 | Iowa | 5 | 4 | 0 | 233 | 100 | 0.771 | 80.65 |
| 35 | 1961 | Iowa | 5 | 4 | 0 | 215 | 162 | 0.764 | 80.50 |
| 36 | 1995 | Iowa | 7 | 4 | 0 | 334 | 246 | 0.760 | 80.35 |
| 37 | 1962 | Iowa | 4 | 5 | 0 | 127 | 166 | 0.756 | 78.97 |
| 38 | 1987 | Iowa | 10 | 3 | 0 | 380 | 250 | 0.750 | 79.72 |
| 39 | 1920 | Iowa | 4 | 2 | 0 | 79 | 54 | 0.749 | 77.49 |
| 40 | 1925 | Iowa | 3 | 3 | 0 | 52 | 67 | 0.748 | 78.38 |
| 41 | 1981 | Iowa | 8 | 4 | 0 | 260 | 157 | 0.745 | 79.75 |
| 42 | 2005 | Iowa | 6 | 5 | 0 | 315 | 219 | 0.743 | 79.81 |
| 43 | 2008 | Iowa | 8 | 4 | 0 | 348 | 166 | 0.735 | 79.73 |
| 44 | 1923 | Iowa | 4 | 3 | 0 | 80 | 52 | 0.735 | 76.81 |
| 45 | 1986 | Iowa | 9 | 3 | 0 | 391 | 214 | 0.729 | 78.78 |
| 46 | 2016 | Iowa | 8 | 5 | 0 | 324 | 245 | 0.726 | 79.23 |
| 47 | 1949 | Iowa | 4 | 5 | 0 | 184 | 247 | 0.722 | 77.16 |
| 48 | 1963 | Iowa | 3 | 3 | 2 | 126 | 112 | 0.718 | 77.70 |
| 49 | 1982 | Iowa | 8 | 4 | 0 | 229 | 230 | 0.716 | 77.28 |
| 50 | 1940 | Iowa | 3 | 4 | 0 | 79 | 98 | 0.714 | 76.84 |
| 51 | 1900 | Iowa | 4 | 0 | 1 | 139 | 12 | 0.714 | 76.89 |
| 52 | 1984 | Iowa | 8 | 4 | 1 | 359 | 201 | 0.707 | 77.74 |
| 53 | 2013 | Iowa | 8 | 5 | 0 | 342 | 246 | 0.697 | 76.38 |
| 54 | 2001 | Iowa | 7 | 5 | 0 | 391 | 258 | 0.695 | 76.77 |
| 55 | 1947 | Iowa | 2 | 5 | 1 | 86 | 179 | 0.692 | 75.60 |
| 56 | 1911 | Iowa | 2 | 3 | 0 | 23 | 45 | 0.686 | 74.31 |
| 57 | 1968 | Iowa | 5 | 5 | 0 | 322 | 289 | 0.681 | 75.07 |
| 58 | 2010 | Iowa | 7 | 5 | 0 | 339 | 214 | 0.676 | 75.60 |
| 59 | 1997 | Iowa | 6 | 5 | 0 | 345 | 159 | 0.672 | 75.34 |
| 60 | 1914 | Iowa | 2 | 3 | 0 | 60 | 36 | 0.672 | 73.43 |
| 61 | 1942 | Iowa | 6 | 4 | 0 | 147 | 135 | 0.672 | 74.96 |
| 62 | 1955 | Iowa | 3 | 5 | 1 | 166 | 173 | 0.665 | 74.30 |
| 63 | 1979 | Iowa | 5 | 6 | 0 | 239 | 216 | 0.662 | 74.65 |
| 64 | 1964 | Iowa | 3 | 6 | 0 | 170 | 209 | 0.641 | 73.52 |
| 65 | 1994 | Iowa | 5 | 5 | 1 | 307 | 324 | 0.634 | 72.96 |
| 66 | 1988 | Iowa | 6 | 4 | 3 | 336 | 233 | 0.621 | 72.08 |
| 67 | 1969 | Iowa | 5 | 5 | 0 | 255 | 275 | 0.604 | 70.87 |
| 68 | 1948 | Iowa | 4 | 5 | 0 | 127 | 142 | 0.604 | 70.71 |
| 69 | 1910 | Iowa | 4 | 2 | 0 | 82 | 15 | 0.600 | 69.87 |
| 70 | 1930 | Iowa | 3 | 4 | 0 | 50 | 62 | 0.599 | 70.37 |
| 71 | 2011 | Iowa | 7 | 6 | 0 | 358 | 310 | 0.592 | 70.74 |
| 72 | 1913 | Iowa | 3 | 2 | 0 | 189 | 48 | 0.587 | 69.42 |
| 73 | 1907 | Iowa | 3 | 2 | 0 | 90 | 48 | 0.587 | 69.36 |
| 74 | 1976 | Iowa | 5 | 6 | 0 | 161 | 234 | 0.580 | 69.92 |
| 75 | 1903 | Iowa | 8 | 2 | 0 | 142 | 102 | 0.578 | 68.97 |
| 76 | 1941 | Iowa | 3 | 5 | 0 | 91 | 99 | 0.562 | 68.44 |
| 77 | 1950 | Iowa | 3 | 5 | 1 | 121 | 201 | 0.562 | 68.37 |
| 78 | 2014 | Iowa | 7 | 6 | 0 | 367 | 333 | 0.561 | 68.72 |
| 79 | 1977 | Iowa | 4 | 7 | 0 | 171 | 229 | 0.560 | 68.44 |
| 80 | 1992 | Iowa | 5 | 7 | 0 | 243 | 278 | 0.552 | 68.42 |
| 81 | 1917 | Iowa | 1 | 3 | 0 | 20 | 95 | 0.544 | 66.98 |
| 82 | 2006 | Iowa | 5 | 7 | 0 | 269 | 262 | 0.531 | 66.98 |
| 83 | 1951 | Iowa | 2 | 5 | 2 | 161 | 233 | 0.528 | 66.64 |
| 84 | 1936 | Iowa | 1 | 4 | 1 | 38 | 96 | 0.517 | 65.89 |
| 85 | 1902 | Iowa | 4 | 4 | 0 | 95 | 233 | 0.515 | 65.66 |
| 86 | 1993 | Iowa | 6 | 6 | 0 | 214 | 293 | 0.514 | 65.90 |
| 87 | 1970 | Iowa | 3 | 6 | 1 | 129 | 259 | 0.504 | 65.25 |
| 88 | 1980 | Iowa | 4 | 7 | 0 | 154 | 238 | 0.493 | 64.68 |
| 89 | 1952 | Iowa | 2 | 7 | 0 | 121 | 220 | 0.492 | 64.58 |
| 90 | 1944 | Iowa | 1 | 7 | 0 | 53 | 240 | 0.485 | 64.05 |
| 91 | 1974 | Iowa | 3 | 8 | 0 | 157 | 308 | 0.482 | 64.01 |
| 92 | 1916 | Iowa | 2 | 3 | 0 | 73 | 143 | 0.479 | 63.77 |
| 93 | 2007 | Iowa | 6 | 6 | 0 | 222 | 225 | 0.468 | 63.05 |
| 94 | 1943 | Iowa | 1 | 6 | 1 | 83 | 153 | 0.467 | 63.49 |
| 95 | 1972 | Iowa | 3 | 7 | 1 | 109 | 208 | 0.467 | 63.05 |
| 96 | 1934 | Iowa | 1 | 5 | 1 | 64 | 153 | 0.465 | 63.04 |
| 97 | 1989 | Iowa | 5 | 6 | 0 | 197 | 278 | 0.462 | 62.89 |
| 98 | 1904 | Iowa | 3 | 4 | 0 | 102 | 102 | 0.455 | 62.75 |
| 99 | 1927 | Iowa | 2 | 4 | 0 | 37 | 77 | 0.442 | 61.42 |
| 100 | 2000 | Iowa | 3 | 9 | 0 | 203 | 330 | 0.433 | 61.13 |
| 101 | 1909 | Iowa | 1 | 4 | 1 | 55 | 97 | 0.432 | 61.08 |
| 102 | 1906 | Iowa | 1 | 2 | 0 | 30 | 24 | 0.425 | 60.77 |
| 103 | 1975 | Iowa | 3 | 8 | 0 | 182 | 279 | 0.412 | 59.77 |
| 104 | 2012 | Iowa | 4 | 8 | 0 | 232 | 275 | 0.403 | 59.32 |
| 105 | 1926 | Iowa | 1 | 5 | 0 | 52 | 110 | 0.395 | 59.26 |
| 106 | 1998 | Iowa | 3 | 8 | 0 | 172 | 287 | 0.384 | 58.37 |
| 107 | 1965 | Iowa | 1 | 9 | 0 | 94 | 192 | 0.365 | 56.78 |
| 108 | 1931 | Iowa | 0 | 6 | 1 | 0 | 131 | 0.359 | 57.64 |
| 109 | 1945 | Iowa | 1 | 7 | 0 | 60 | 297 | 0.344 | 56.43 |
| 110 | 1915 | Iowa | 1 | 4 | 0 | 42 | 144 | 0.336 | 56.27 |
| 111 | 1901 | Iowa | 3 | 3 | 0 | 35 | 109 | 0.327 | 55.96 |
| 112 | 1978 | Iowa | 2 | 9 | 0 | 125 | 291 | 0.324 | 54.37 |
| 113 | 1967 | Iowa | 1 | 8 | 1 | 161 | 277 | 0.314 | 53.90 |
| 114 | 1938 | Iowa | 1 | 6 | 1 | 46 | 135 | 0.300 | 53.44 |
| 115 | 1999 | Iowa | 1 | 10 | 0 | 162 | 347 | 0.290 | 51.75 |
| 116 | 1971 | Iowa | 1 | 10 | 0 | 121 | 379 | 0.280 | 51.97 |
| 117 | 1966 | Iowa | 2 | 8 | 0 | 86 | 253 | 0.279 | 52.13 |
| 118 | 1973 | Iowa | 0 | 11 | 0 | 140 | 401 | 0.270 | 52.32 |
| 119 | 1932 | Iowa | 0 | 7 | 0 | 31 | 164 | 0.241 | 50.63 |
| 120 | 1937 | Iowa | 0 | 7 | 0 | 22 | 113 | 0.236 | 49.90 |
| 121 | 1908 | Iowa | 0 | 5 | 0 | 24 | 65 | 0.212 | 49.73 |