| Year | Right Handed | Left Handed |
|---|---|---|
| 2007 | -27.54 | -30.66 |
| 2008 | -27.43 | -30.50 |
| 2009 | -29.69 | -32.09 |
| 2010 | -31.65 | -32.55 |
| 2012 | -31.75 | -31.63 |
| 2013 | -29.92 | -32.34 |
| 2014 | -31.09 | -32.53 |
| 2015 | -29.57 | -32.39 |
| 2016 | -31.67 | -32.95 |
| 2017 | -31.81 | -34.43 |
| 2018 | -35.82 | -37.54 |
| 2019 | -34.27 | -36.72 |
| 2020 | -36.78 | -36.19 |
| 2021 | -32.01 | -34.27 |