| Year | |
|---|---|
| 1997 | 560.0 |
| 1998 | 577.1 |
| 1999 | 290.0 |
| 2000 | 371.1 |
| 2001 | 703.8 |
| 2002 | 537.0 |
| 2003 | 340.6 |
| 2004 | 486.4 |
| 2005 | 557.9 |
| 2006 | 560.4 |
| 2007 | 534.1 |
| 2008 | 401.4 |
| 2009 | 311.7 |
| 2010 | 353.9 |
| 2011 | 276.7 |
| 2012 | 311.6 |
| 2013 | 397.4 |
| 2014 | 419.0 |
| 2015 | 540.9 |
| 2016 | 469.4 |
| 2017 | 346.1 |
| 2018 | 360.2 |
| 2019 | 292.0 |
| 2020 | 277.9 |
| 2021 | 292.4 |
| 2022 | 334.4 |