| Rank | Seasons | Avg |
|---|---|---|
| 1 | 2015-2016 | 18.19 |
| 2 | 2010-2011 | 18.00 |
| 3 | 2016-2017 | 17.70 |
| 4 | 2018-2019 | 17.48 |
| 5 | 2013-2014 | 17.44 |
| 6 | 2008-2009 | 17.19 |
| 7 | 2011-2012 | 17.15 |
| 8 | 2012-2013 | 17.11 |
| 9 | 2009-2010 | 17.04 |
| 10 | 2014-2015 | 16.81 |
| 11 | 2017-2018 | 16.52 |
| 12 | 2022-2023 | 16.22 |
| 13 | 2021-2022 | 15.93 |
| 14 | 2019-2020 | 15.50 |
| 15 | 2023-2024 | 14.03 |