| Year | Value | | 2022 | 53,343 | | 2021 | 51,942 | | 2020 | 50,775 | | 2019 | 49,849 | | 2018 | 49,148 | | 2017 | 48,605 | | 2016 | 48,055 | | 2015 | 47,393 | | 2014 | 46,607 | | 2013 | 45,710 | | 2012 | 44,769 | | 2011 | 43,802 | | 2010 | 42,800 | | 2009 | 41,805 | | 2008 | 40,842 | | 2007 | 39,981 | | 2006 | 39,195 | | 2005 | 38,763 | | 2004 | 38,803 | | 2003 | 38,969 | | 2002 | 38,629 | | 2001 | 37,587 | | 2000 | 36,427 | | 1999 | 35,201 | | 1998 | 33,652 | | 1997 | 31,703 | | 1996 | 30,055 | | 1995 | 29,085 | | 1994 | 28,573 | | 1993 | 27,779 | | 1992 | 28,093 | | 1991 | 28,126 | | 1990 | 25,622 | | 1989 | 22,937 | | 1988 | 21,047 | | 1987 | 19,569 | | 1986 | 18,208 | | 1985 | 17,061 | | 1984 | 16,148 | | 1983 | 15,426 | | 1982 | 14,796 | | 1981 | 14,133 | | 1980 | 13,344 | | 1979 | 12,401 | | 1978 | 11,344 | | 1977 | 10,266 | | 1976 | 9,269 | | 1975 | 8,446 | | 1974 | 7,866 | | 1973 | 7,496 | | 1972 | 7,205 | | 1971 | 6,930 | | 1970 | 6,664 | | 1969 | 6,333 | | 1968 | 5,956 | | 1967 | 5,616 | | 1966 | 5,295 | | 1965 | 4,984 | | 1964 | 4,696 | | 1963 | 4,443 | | 1962 | 4,230 | | 1961 | 4,052 | | 1960 | 3,895 |
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