| Year | |
|---|---|
| 1997 | 190.3 |
| 1998 | 186.5 |
| 1999 | 114.8 |
| 2000 | 124.1 |
| 2001 | 120.7 |
| 2002 | 127.1 |
| 2003 | 132.3 |
| 2004 | 136.8 |
| 2005 | 138.1 |
| 2006 | 146.8 |
| 2007 | 163.2 |
| 2008 | 179.6 |
| 2009 | 175.1 |
| 2010 | 170.3 |
| 2011 | 176.1 |
| 2012 | 175.2 |
| 2013 | 193.1 |
| 2014 | 195.0 |
| 2015 | 199.7 |
| 2016 | 177.9 |
| 2017 | 180.0 |
| 2018 | 188.3 |
| 2019 | 188.2 |
| 2020 | 192.1 |
| 2021 | 202.4 |
| 2022 | 187.1 |
| 2023 | 187.2 |
| 2024 | 190.9 |