| Year | Value | | 2022 | 8,028 | | 2021 | 8,054 | | 2020 | 7,985 | | 2019 | 7,861 | | 2018 | 7,732 | | 2017 | 7,607 | | 2016 | 7,493 | | 2015 | 7,410 | | 2014 | 7,353 | | 2013 | 7,307 | | 2012 | 7,252 | | 2011 | 7,162 | | 2010 | 7,023 | | 2009 | 6,919 | | 2008 | 6,857 | | 2007 | 6,779 | | 2006 | 6,717 | | 2005 | 6,695 | | 2004 | 6,712 | | 2003 | 6,733 | | 2002 | 6,727 | | 2001 | 6,697 | | 2000 | 6,650 | | 1999 | 6,586 | | 1998 | 6,508 | | 1997 | 6,430 | | 1996 | 6,379 | | 1995 | 6,369 | | 1994 | 6,367 | | 1993 | 6,327 | | 1992 | 6,219 | | 1991 | 6,079 | | 1990 | 5,948 | | 1989 | 5,827 | | 1988 | 5,704 | | 1987 | 5,553 | | 1986 | 5,367 | | 1985 | 5,154 | | 1984 | 4,926 | | 1983 | 4,695 | | 1982 | 4,474 | | 1981 | 4,276 | | 1980 | 4,095 | | 1979 | 3,937 | | 1978 | 3,805 | | 1977 | 3,689 | | 1976 | 3,583 | | 1975 | 3,484 | | 1974 | 3,390 | | 1973 | 3,291 | | 1972 | 3,189 | | 1971 | 3,088 | | 1970 | 2,991 | | 1969 | 2,933 | | 1968 | 2,920 | | 1967 | 2,919 | | 1966 | 2,926 | | 1965 | 2,934 | | 1964 | 2,946 | | 1963 | 2,967 | | 1962 | 2,991 | | 1961 | 3,016 | | 1960 | 3,044 |
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