| Year | Hard | Breaking | Offspeed |
|---|---|---|---|
| 2008 | -1.12 | -1.26 | -1.29 |
| 2009 | -1.06 | -1.17 | -1.08 |
| 2010 | -0.59 | -0.61 | -0.76 |
| 2011 | -0.54 | -0.57 | -0.69 |
| 2012 | -0.40 | -0.38 | -0.50 |
| 2013 | -0.08 | -0.09 | -0.22 |
| 2014 | -0.13 | -0.17 | -0.22 |
| 2015 | -0.47 | -0.48 | -0.60 |
| 2016 | -0.07 | -0.21 | -0.31 |
| 2017 | -0.25 | -0.36 | -0.50 |
| 2018 | 0.08 | -0.06 | -0.14 |