| Rank | Season | 1st Downs | 1st Downs Gained/Game | % of 1st Downs Gained on 1st Down | % of 1st Downs Gained on 2nd Down | % of 1st Downs Gained on 3rd Down | % of 1st Downs Gained on 4th Down |
|---|
| 1 | 2023 | 295 | 22.7 | 29.8 | 36.9 | 28.5 | 4.7 |
| 2 | 2022 | 313 | 24.1 | 32.9 | 33.5 | 29.4 | 4.2 |
| 3 | 2021 | 208 | 17.3 | 27.9 | 37.0 | 29.3 | 5.8 |
| 4 | 2020 | 232 | 17.8 | 23.7 | 44.4 | 28.4 | 3.4 |
| 5 | 2019 | 218 | 16.8 | 29.8 | 44.0 | 23.4 | 2.8 |
| 6 | 2018 | 228 | 17.5 | 34.6 | 36.0 | 26.8 | 2.6 |
| 7 | 2017 | 213 | 17.8 | 22.5 | 37.6 | 31.9 | 8.0 |
| 8 | 2016 | 242 | 20.2 | 21.9 | 40.9 | 33.9 | 3.3 |
| 9 | 2015 | 266 | 20.5 | 33.1 | 30.8 | 28.6 | 7.5 |
| 10 | 2014 | 286 | 23.8 | 32.9 | 37.4 | 25.9 | 3.8 |
| 11 | 2013 | 246 | 22.4 | 29.7 | 37.0 | 28.9 | 4.5 |
| 12 | 2012 | 330 | 23.6 | 30.3 | 43.0 | 22.4 | 4.2 |
| 13 | 2011 | 321 | 22.9 | 28.0 | 42.4 | 25.9 | 3.7 |
| 14 | 2010 | 303 | 20.2 | 29.0 | 32.0 | 31.7 | 7.3 |
| 15 | 2009 | 186 | 16.9 | 23.7 | 37.1 | 35.5 | 3.8 |
| 16 | 2008 | 238 | 21.6 | 33.6 | 38.7 | 21.8 | 5.9 |
| 17 | 2007 | 242 | 22.0 | 24.8 | 39.3 | 27.3 | 8.7 |
| 18 | 2006 | 196 | 17.8 | 34.2 | 35.2 | 26.5 | 4.1 |
| 19 | 2005 | 305 | 25.4 | 28.9 | 36.7 | 26.2 | 8.2 |
| 20 | 2004 | 310 | 25.8 | 26.5 | 39.0 | 26.1 | 8.4 |
| 21 | 2003 | 239 | 21.7 | 30.5 | 36.8 | 28.0 | 4.6 |
| 22 | 2002 | 309 | 22.1 | 25.2 | 40.8 | 28.5 | 5.5 |
| 23 | 2000 | 345 | 23.0 | 33.9 | 34.2 | 27.0 | 4.9 |
| 24 | 1999 | 405 | 27.0 | 35.3 | 36.0 | 24.9 | 3.7 |
| 25 | 1998 | 397 | 26.5 | 32.7 | 38.8 | 23.9 | 4.5 |