| Year | # | Maximum IF | Minimum IF | Average IF |
| 2026 | 156 | 39 | 1.1 | 4.581 |
| 2025 | 188 | 38.6 | 0 | 4.761 |
| 2024 | 171 | 39 | 1.1 | 4.667 |
| 2023 | 136 | 19.3 | 0.413 | 4.825 |
| 2022 | 119 | 19.3 | 1.1 | 4.248 |
| 2021 | 138 | 12.4 | 0.59 | 4.144 |
| 2020 | 132 | 16 | 0.727 | 4.04 |
| 2019 | 118 | 11.3 | 0.5 | 3.908 |
| 2018 | 121 | 55.8 | 0.3 | 4.904 |
| 2017 | 159 | 13.1 | 0.32 | 3.866 |
| 2016 | 170 | 13 | 0.2 | 3.767 |
| 2015 | 192 | 12.5 | 0.555 | 3.843 |
| 2014 | 203 | 15.7 | 0.4 | 3.527 |
| 2013 | 179 | 12.5 | 0.413 | 3.969 |
| 2012 | 162 | 12.9 | 0.413 | 3.571 |
| 2011 | 176 | 12.9 | 0 | 3.687 |
| 2010 | 135 | 12.9 | 0.5 | 3.677 |
| 2009 | 96 | 16.3 | 0.562 | 3.996 |
| 2008 | 135 | 16.9 | 0.2 | 3.354 |
| 2007 | 132 | 15.6 | 0.2 | 3.947 |
| 2006 | 121 | 11.5 | 0.6 | 3.461 |
| 2005 | 136 | 13.3 | 0.206 | 3.34 |
| 2004 | 127 | 55.8 | 0.664 | 4.095 |
| 2003 | 74 | 29 | 0.593 | 4.337 |
| 2002 | 64 | 12.5 | 0.417 | 3.889 |
| 2001 | 38 | 55.8 | 0.215 | 5.364 |
| 2000 | 32 | 6.3 | 0.5 | 2.787 |
| 1999 | 20 | 5.2 | 0.215 | 2.714 |
| 1998 | 10 | 5.2 | 1.1 | 3.091 |
| 1997 | 5 | 3.1 | 1.5 | 2.004 |
| 1996 | 2 | 11.5 | 11.5 | 11.5 |