| Year | Value | | 2022 | 10,863 | | 2021 | 10,648 | | 2020 | 10,738 | | 2019 | 10,882 | | 2018 | 11,053 | | 2017 | 11,143 | | 2016 | 11,040 | | 2015 | 10,939 | | 2014 | 10,879 | | 2013 | 10,786 | | 2012 | 10,660 | | 2011 | 10,565 | | 2010 | 10,478 | | 2009 | 10,292 | | 2008 | 10,035 | | 2007 | 9,705 | | 2006 | 9,402 | | 2005 | 9,120 | | 2004 | 8,852 | | 2003 | 8,633 | | 2002 | 8,415 | | 2001 | 8,107 | | 2000 | 7,768 | | 1999 | 7,489 | | 1998 | 7,178 | | 1997 | 6,870 | | 1996 | 6,593 | | 1995 | 6,281 | | 1994 | 5,948 | | 1993 | 5,622 | | 1992 | 5,332 | | 1991 | 5,183 | | 1990 | 5,156 | | 1989 | 5,181 | | 1988 | 5,232 | | 1987 | 5,299 | | 1986 | 5,370 | | 1985 | 5,466 | | 1984 | 5,551 | | 1983 | 5,569 | | 1982 | 5,554 | | 1981 | 5,513 | | 1980 | 5,371 | | 1979 | 5,203 | | 1978 | 5,154 | | 1977 | 5,134 | | 1976 | 5,086 | | 1975 | 5,038 | | 1974 | 4,967 | | 1973 | 4,860 | | 1972 | 4,770 | | 1971 | 4,659 | | 1970 | 4,537 | | 1969 | 4,499 | | 1968 | 4,472 | | 1967 | 4,410 | | 1966 | 4,387 | | 1965 | 4,333 | | 1964 | 4,232 | | 1963 | 4,158 | | 1962 | 4,083 | | 1961 | 3,984 | | 1960 | 3,924 |
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