| Year | Value | | 2023 | 479,566 | | 2022 | 475,686 | | 2021 | 470,131 | | 2020 | 470,301 | | 2019 | 458,722 | | 2018 | 454,984 | | 2017 | 468,973 | | 2016 | 482,302 | | 2015 | 489,842 | | 2014 | 498,648 | | 2013 | 507,165 | | 2012 | 513,602 | | 2011 | 520,656 | | 2010 | 536,291 | | 2009 | 551,888 | | 2008 | 571,803 | | 2007 | 584,889 | | 2006 | 598,590 | | 2005 | 591,568 | | 2004 | 567,622 | | 2003 | 571,824 | | 2002 | 557,083 | | 2001 | 544,106 | | 2000 | 531,148 | | 1999 | 552,553 | | 1998 | 523,208 | | 1997 | 520,086 | | 1996 | 499,866 | | 1995 | 484,854 | | 1994 | 480,991 | | 1993 | 477,069 | | 1992 | 442,034 | | 1991 | 426,134 |
|