| Year | |
|---|---|
| 1997 | 99.8 |
| 1998 | 110.0 |
| 1999 | 83.2 |
| 2000 | 95.0 |
| 2001 | 97.3 |
| 2002 | 95.3 |
| 2003 | 105.8 |
| 2004 | 107.6 |
| 2005 | 105.7 |
| 2006 | 102.6 |
| 2007 | 105.3 |
| 2008 | 109.9 |
| 2009 | 95.9 |
| 2010 | 94.7 |
| 2011 | 94.9 |
| 2012 | 93.6 |
| 2013 | 123.7 |
| 2014 | 112.2 |
| 2015 | 105.1 |
| 2016 | 106.8 |
| 2017 | 106.3 |
| 2018 | 101.7 |
| 2019 | 97.0 |
| 2020 | 68.3 |
| 2021 | 84.2 |
| 2022 | 98.6 |
| 2023 | 110.9 |
| 2024 | 110.8 |