| Year | Value | | 2021 | 825,994 | | 2020 | 623,201 | | 2019 | 940,499 | | 2018 | 885,094 | | 2017 | 815,708 | | 2016 | 746,446 | | 2015 | 767,043 | | 2014 | 747,804 | | 2013 | 678,071 | | 2012 | 636,748 | | 2011 | 596,042 | | 2010 | 523,759 | | 2009 | 475,261 | | 2008 | 522,577 | | 2007 | 467,670 | | 2006 | 421,170 | | 2005 | 390,824 | | 2004 | 398,958 | | 2003 | 350,963 | | 2002 | 345,262 | | 2001 | 329,935 | | 2000 | 314,621 | | 1999 | 321,400 | | 1998 | 280,500 | | 1997 | 395,300 | | 1996 | 464,700 | | 1995 | 586,300 | | 1994 | 683,400 | | 1993 | 815,400 |
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