Year | Value | 2021 | 30,115 | 2020 | 25,563 | 2019 | 21,500 | 2018 | 24,313 | 2017 | 22,435 | 2009 | 27,692 | 2008 | 29,530 | 2007 | 29,980 | 2006 | 30,232 | 2005 | 25,789 | 2004 | 28,970 | 2003 | 27,471 | 2002 | 24,592 | 2001 | 18,805 | 2000 | 16,109 | 1999 | 33,100 | 1998 | 32,000 | 1997 | 33,100 | 1996 | 41,300 | 1995 | 45,800 | 1994 | 41,900 | 1993 | 43,500 | 1992 | 96,000 | 1991 | 66,300 | 1990 | 66,400 | 1989 | 36,300 | 1988 | 33,800 | 1987 | 32,000 |
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