| Year | Value | | 2022 | 6,896 | | 2021 | 6,471 | | 2020 | 6,090 | | 2019 | 5,729 | | 2018 | 5,422 | | 2017 | 5,227 | | 2016 | 5,090 | | 2015 | 4,982 | | 2014 | 4,883 | | 2013 | 4,782 | | 2012 | 4,675 | | 2011 | 4,553 | | 2010 | 4,380 | | 2009 | 4,157 | | 2008 | 3,936 | | 2007 | 3,733 | | 2006 | 3,556 | | 2005 | 3,415 | | 2004 | 3,301 | | 2003 | 3,196 | | 2002 | 3,087 | | 2001 | 2,972 | | 2000 | 2,856 | | 1999 | 2,753 | | 1998 | 2,667 | | 1997 | 2,586 | | 1996 | 2,513 | | 1995 | 2,446 | | 1994 | 2,385 | | 1993 | 2,332 | | 1992 | 2,289 | | 1991 | 2,249 | | 1990 | 2,207 | | 1989 | 2,161 | | 1988 | 2,112 | | 1987 | 2,058 | | 1986 | 1,999 | | 1985 | 1,938 | | 1984 | 1,873 | | 1983 | 1,802 | | 1982 | 1,716 | | 1981 | 1,624 | | 1980 | 1,554 | | 1979 | 1,524 | | 1978 | 1,525 | | 1977 | 1,538 | | 1976 | 1,585 | | 1975 | 1,655 | | 1974 | 1,728 | | 1973 | 1,811 | | 1972 | 1,899 | | 1971 | 1,985 | | 1970 | 2,063 | | 1969 | 2,119 | | 1968 | 2,125 | | 1967 | 2,095 | | 1966 | 2,059 | | 1965 | 2,025 | | 1964 | 1,993 | | 1963 | 1,964 | | 1962 | 1,939 | | 1961 | 1,922 | | 1960 | 1,910 |
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