| Year | Value | | 2024 | 35,699 | | 2023 | 35,308 | | 2022 | 34,886 | | 2021 | 34,452 | | 2020 | 33,954 | | 2019 | 33,364 | | 2018 | 32,685 | | 2017 | 31,914 | | 2016 | 31,058 | | 2015 | 30,123 | | 2014 | 29,121 | | 2013 | 28,069 | | 2012 | 26,986 | | 2011 | 25,895 | | 2010 | 24,821 | | 2009 | 23,765 | | 2008 | 22,736 | | 2007 | 21,759 | | 2006 | 20,814 | | 2005 | 19,985 | | 2004 | 19,308 | | 2003 | 18,684 | | 2002 | 17,932 | | 2001 | 17,019 | | 2000 | 16,147 | | 1999 | 15,331 | | 1998 | 14,492 | | 1997 | 13,615 | | 1996 | 12,949 | | 1995 | 12,666 | | 1994 | 12,756 | | 1993 | 12,824 | | 1992 | 13,451 | | 1991 | 13,869 | | 1990 | 12,894 | | 1989 | 11,649 | | 1988 | 10,704 | | 1987 | 9,951 | | 1986 | 9,265 | | 1985 | 8,691 | | 1984 | 8,247 | | 1983 | 7,910 | | 1982 | 7,626 | | 1981 | 7,321 | | 1980 | 6,948 | | 1979 | 6,490 | | 1978 | 5,964 | | 1977 | 5,419 | | 1976 | 4,910 | | 1975 | 4,468 |
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