| Year | In Zone | Out of Zone |
|---|---|---|
| 2007 | -1.04 | -1.03 |
| 2008 | -1.09 | -1.09 |
| 2009 | -1.35 | -1.33 |
| 2010 | -1.32 | -1.30 |
| 2012 | -1.28 | -1.26 |
| 2013 | -1.26 | -1.26 |
| 2014 | -1.27 | -1.27 |
| 2015 | -1.17 | -1.18 |
| 2016 | -1.33 | -1.33 |
| 2017 | -1.35 | -1.33 |
| 2018 | -1.56 | -1.58 |
| 2019 | -1.52 | -1.52 |
| 2020 | -1.29 | -1.26 |
| 2021 | -1.25 | -1.23 |