| Year | PToutP | Base 100 |
|---|---|---|
| 2008 | 91.81% | 100 |
| 2009 | 91.35% | 100.7 |
| 2010 | 93.22% | 101.3 |
| 2011 | 93.18% | 102 |
| 2012 | 93.01% | 102.7 |
| 2013 | 93.34% | 103.3 |
| 2014 | 95.17% | 104 |
| 2015 | 96.42% | 104.7 |
| 2016 | 97.51% | 105.3 |
| 2017 | 100% | 106 |
| 2018 | 97.14% | 106.7 |
| 2019 | 97.75% | 107.3 |
| 2020 | 98.72% | 108 |
| 2021 | 97.93% | 108.7 |
