| Year | |
|---|---|
| 1997 | 447.6 |
| 1998 | 408.1 |
| 1999 | 591.7 |
| 2000 | 588.0 |
| 2001 | 840.9 |
| 2002 | 991.9 |
| 2003 | 1,387.6 |
| 2004 | 1,342.8 |
| 2005 | 1,216.2 |
| 2006 | 1,229.5 |
| 2007 | 1,474.5 |
| 2008 | 1,199.7 |
| 2009 | 951.0 |
| 2010 | 966.9 |
| 2011 | 765.7 |
| 2012 | 709.2 |
| 2013 | 706.0 |
| 2014 | 807.8 |
| 2015 | 764.1 |
| 2016 | 795.9 |
| 2017 | 1,063.0 |
| 2018 | 1,055.8 |
| 2019 | 891.7 |
| 2020 | 710.3 |
| 2021 | 810.7 |
| 2022 | 763.9 |
| 2023 | 720.5 |
| 2024 | 637.9 |