| Year | Value | | 2022 | 29,449 | | 2021 | 28,704 | | 2020 | 27,927 | | 2019 | 27,177 | | 2018 | 26,195 | | 2017 | 24,837 | | 2016 | 23,114 | | 2015 | 21,235 | | 2014 | 19,582 | | 2013 | 18,233 | | 2012 | 17,010 | | 2011 | 15,949 | | 2010 | 15,095 | | 2009 | 14,305 | | 2008 | 13,663 | | 2007 | 13,307 | | 2006 | 13,139 | | 2005 | 13,008 | | 2004 | 12,891 | | 2003 | 12,785 | | 2002 | 12,564 | | 2001 | 12,199 | | 2000 | 11,804 | | 1999 | 11,467 | | 1998 | 11,232 | | 1997 | 11,272 | | 1996 | 11,564 | | 1995 | 11,984 | | 1994 | 12,320 | | 1993 | 12,388 | | 1992 | 12,252 | | 1991 | 11,853 | | 1990 | 11,265 | | 1989 | 10,602 | | 1988 | 9,964 | | 1987 | 9,481 | | 1986 | 9,157 | | 1985 | 8,970 | | 1984 | 8,917 | | 1983 | 8,904 | | 1982 | 8,816 | | 1981 | 8,604 | | 1980 | 8,326 | | 1979 | 7,983 | | 1978 | 7,619 | | 1977 | 7,335 | | 1976 | 7,093 | | 1975 | 6,893 | | 1974 | 6,699 | | 1973 | 6,508 | | 1972 | 6,309 | | 1971 | 6,083 | | 1970 | 5,860 | | 1969 | 5,677 | | 1968 | 5,522 | | 1967 | 5,373 | | 1966 | 5,213 | | 1965 | 5,024 | | 1964 | 4,803 | | 1963 | 4,577 | | 1962 | 4,326 | | 1961 | 4,019 | | 1960 | 3,808 |
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