| Year | Hard | Breaking | Offspeed |
|---|---|---|---|
| 2008 | -17.04 | -44.89 | -27.22 |
| 2009 | -17.49 | -40.13 | -26.31 |
| 2010 | -15.79 | -37.13 | -26.88 |
| 2011 | -14.49 | -36.22 | -27.88 |
| 2012 | -14.42 | -36.28 | -26.58 |
| 2013 | -12.03 | -33.18 | -26.09 |
| 2014 | -12.51 | -31.35 | -26.31 |
| 2015 | -13.78 | -34.70 | -26.30 |
| 2016 | -13.48 | -36.36 | -28.58 |
| 2017 | -16.17 | -36.56 | -31.15 |
| 2018 | -16.54 | -37.65 | -30.86 |