| Year | PToutP | Base 100 |
|---|---|---|
| 2008 | 100% | 100 |
| 2009 | 80.67% | 99 |
| 2010 | 78.91% | 98.1 |
| 2011 | 78.88% | 97.1 |
| 2012 | 79.6% | 96.2 |
| 2013 | 78.23% | 95.2 |
| 2014 | 78.84% | 94.3 |
| 2015 | 79.16% | 93.3 |
| 2016 | 78.94% | 92.4 |
| 2017 | 78.46% | 91.4 |
| 2018 | 76.66% | 90.5 |
| 2019 | 75.86% | 89.5 |
| 2020 | 77.4% | 88.6 |
| 2021 | 77.91% | 87.6 |
