| Year | Value | | 2022 | 15,975 | | 2021 | 15,824 | | 2020 | 15,530 | | 2019 | 15,105 | | 2018 | 14,608 | | 2017 | 14,167 | | 2016 | 13,782 | | 2015 | 13,453 | | 2014 | 13,155 | | 2013 | 12,810 | | 2012 | 12,418 | | 2011 | 12,027 | | 2010 | 11,613 | | 2009 | 11,182 | | 2008 | 10,809 | | 2007 | 10,484 | | 2006 | 10,138 | | 2005 | 9,788 | | 2004 | 9,443 | | 2003 | 9,108 | | 2002 | 8,772 | | 2001 | 8,418 | | 2000 | 8,044 | | 1999 | 7,654 | | 1998 | 7,259 | | 1997 | 6,863 | | 1996 | 6,586 | | 1995 | 6,431 | | 1994 | 6,387 | | 1993 | 6,346 | | 1992 | 6,180 | | 1991 | 6,003 | | 1990 | 5,846 | | 1989 | 5,752 | | 1988 | 5,665 | | 1987 | 5,576 | | 1986 | 5,539 | | 1985 | 5,532 | | 1984 | 5,534 | | 1983 | 5,524 | | 1982 | 5,503 | | 1981 | 5,447 | | 1980 | 5,369 | | 1979 | 5,286 | | 1978 | 5,195 | | 1977 | 5,099 | | 1976 | 4,996 | | 1975 | 4,890 | | 1974 | 4,781 | | 1973 | 4,671 | | 1972 | 4,558 | | 1971 | 4,443 | | 1970 | 4,327 | | 1969 | 4,213 | | 1968 | 4,102 | | 1967 | 3,992 | | 1966 | 3,886 | | 1965 | 3,782 | | 1964 | 3,676 | | 1963 | 3,569 | | 1962 | 3,465 | | 1961 | 3,373 | | 1960 | 3,300 |
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