| Year | Hard | Breaking | Offspeed |
|---|---|---|---|
| 2008 | -2.27 | 5.44 | -1.89 |
| 2009 | -2.42 | 5.28 | -1.25 |
| 2010 | -2.69 | 4.24 | -2.82 |
| 2011 | -2.02 | 3.97 | -5.31 |
| 2012 | -1.94 | 3.91 | -4.98 |
| 2013 | -2.56 | 3.72 | -5.71 |
| 2014 | -2.35 | 3.39 | -6.25 |
| 2015 | -1.48 | 3.75 | -6.54 |
| 2016 | -2.68 | 3.70 | -7.06 |
| 2017 | -2.98 | 3.18 | -6.74 |
| 2018 | -0.59 | 2.71 | -6.69 |