| Year | Value | | 2024 | 50,260 | | 2023 | 48,544 | | 2022 | 47,048 | | 2021 | 46,445 | | 2020 | 46,416 | | 2019 | 46,170 | | 2018 | 46,091 | | 2017 | 46,296 | | 2016 | 46,593 | | 2015 | 46,872 | | 2014 | 47,135 | | 2013 | 47,299 | | 2012 | 47,159 | | 2011 | 46,582 | | 2010 | 45,522 | | 2009 | 43,968 | | 2008 | 42,008 | | 2007 | 39,791 | | 2006 | 38,299 | | 2005 | 37,615 | | 2004 | 36,929 | | 2003 | 36,291 | | 2002 | 35,746 | | 2001 | 35,384 | | 2000 | 35,076 | | 1999 | 34,646 | | 1998 | 34,077 | | 1997 | 33,452 | | 1996 | 32,832 | | 1995 | 32,252 | | 1994 | 30,991 | | 1993 | 29,104 | | 1992 | 27,625 | | 1991 | 26,547 | | 1990 | 25,594 | | 1989 | 24,707 | | 1988 | 23,886 | | 1987 | 23,098 | | 1986 | 22,363 | | 1985 | 21,698 | | 1984 | 21,132 | | 1983 | 20,621 | | 1982 | 20,091 | | 1981 | 19,547 | | 1980 | 19,006 | | 1979 | 18,474 | | 1978 | 17,949 | | 1977 | 17,419 | | 1976 | 16,896 | | 1975 | 16,378 |
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