| Year | PToutP | Base 100 |
|---|---|---|
| 2008 | 1.24% | 100 |
| 2009 | 1.07% | 116.7 |
| 2010 | 1.1% | 133.4 |
| 2011 | 1.14% | 150 |
| 2012 | 1.13% | 166.7 |
| 2013 | 1.2% | 183.4 |
| 2014 | 1.13% | 200.1 |
| 2015 | 1.16% | 216.7 |
| 2016 | 100% | 233.4 |
| 2017 | 1.17% | 250.1 |
| 2018 | 1.42% | 266.8 |
| 2019 | 1.08% | 283.4 |
| 2020 | 1.18% | 300.1 |
| 2021 | 1.25% | 316.8 |
