| Year | Value | | 2022 | 12,795 | | 2021 | 12,399 | | 2020 | 11,954 | | 2019 | 11,482 | | 2018 | 11,005 | | 2017 | 10,532 | | 2016 | 10,083 | | 2015 | 9,685 | | 2014 | 9,344 | | 2013 | 8,982 | | 2012 | 8,583 | | 2011 | 8,229 | | 2010 | 7,940 | | 2009 | 7,684 | | 2008 | 7,515 | | 2007 | 7,455 | | 2006 | 7,413 | | 2005 | 7,354 | | 2004 | 7,280 | | 2003 | 7,192 | | 2002 | 7,085 | | 2001 | 6,956 | | 2000 | 6,805 | | 1999 | 6,645 | | 1998 | 6,484 | | 1997 | 6,317 | | 1996 | 6,151 | | 1995 | 5,989 | | 1994 | 5,823 | | 1993 | 5,655 | | 1992 | 5,488 | | 1991 | 5,320 | | 1990 | 5,152 | | 1989 | 4,968 | | 1988 | 4,762 | | 1987 | 4,548 | | 1986 | 4,324 | | 1985 | 4,092 | | 1984 | 3,860 | | 1983 | 3,636 | | 1982 | 3,420 | | 1981 | 3,221 | | 1980 | 3,055 | | 1979 | 3,048 | | 1978 | 3,117 | | 1977 | 3,085 | | 1976 | 3,021 | | 1975 | 2,956 | | 1974 | 2,886 | | 1973 | 2,813 | | 1972 | 2,735 | | 1971 | 2,650 | | 1970 | 2,562 | | 1969 | 2,472 | | 1968 | 2,384 | | 1967 | 2,302 | | 1966 | 2,227 | | 1965 | 2,155 | | 1964 | 2,086 | | 1963 | 2,016 | | 1962 | 1,945 | | 1961 | 1,872 | | 1960 | 1,797 |
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