| Year | Value | | 2022 | 13,804 | | 2021 | 13,778 | | 2020 | 13,786 | | 2019 | 13,862 | | 2018 | 13,977 | | 2017 | 14,095 | | 2016 | 14,138 | | 2015 | 14,114 | | 2014 | 14,145 | | 2013 | 14,269 | | 2012 | 14,447 | | 2011 | 14,679 | | 2010 | 14,847 | | 2009 | 14,727 | | 2008 | 14,369 | | 2007 | 14,031 | | 2006 | 13,801 | | 2005 | 13,655 | | 2004 | 13,637 | | 2003 | 13,746 | | 2002 | 13,852 | | 2001 | 13,810 | | 2000 | 13,627 | | 1999 | 13,317 | | 1998 | 12,823 | | 1997 | 12,224 | | 1996 | 11,672 | | 1995 | 11,135 | | 1994 | 10,611 | | 1993 | 10,145 | | 1992 | 9,655 | | 1991 | 9,070 | | 1990 | 8,470 | | 1989 | 7,969 | | 1988 | 7,571 | | 1987 | 7,281 | | 1986 | 7,107 | | 1985 | 6,985 | | 1984 | 6,949 | | 1983 | 7,034 | | 1982 | 7,194 | | 1981 | 7,392 | | 1980 | 7,484 | | 1979 | 7,413 | | 1978 | 7,263 | | 1977 | 7,041 | | 1976 | 6,758 | | 1975 | 6,447 | | 1974 | 6,154 | | 1973 | 5,893 | | 1972 | 5,652 | | 1971 | 5,413 | | 1970 | 5,156 | | 1969 | 4,894 | | 1968 | 4,648 | | 1967 | 4,413 | | 1966 | 4,194 | | 1965 | 3,996 | | 1964 | 3,817 | | 1963 | 3,595 | | 1962 | 3,332 | | 1961 | 3,094 | | 1960 | 2,894 |
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