| Year | |
|---|---|
| 1997 | 3,706.2 |
| 1998 | 3,776.9 |
| 1999 | 3,078.3 |
| 2000 | 3,292.6 |
| 2001 | 3,981.2 |
| 2002 | 4,266.6 |
| 2003 | 4,841.7 |
| 2004 | 4,961.2 |
| 2005 | 4,895.7 |
| 2006 | 4,914.0 |
| 2007 | 5,344.8 |
| 2008 | 4,832.9 |
| 2009 | 4,329.8 |
| 2010 | 4,448.6 |
| 2011 | 4,039.3 |
| 2012 | 4,016.6 |
| 2013 | 4,127.6 |
| 2014 | 4,323.5 |
| 2015 | 4,367.7 |
| 2016 | 4,319.4 |
| 2017 | 4,476.6 |
| 2018 | 4,541.0 |
| 2019 | 4,347.0 |
| 2020 | 3,968.3 |
| 2021 | 4,105.4 |
| 2022 | 4,214.3 |
| 2023 | 4,199.5 |
| 2024 | 4,152.5 |