| Year | Value | | 2022 | 12,392 | | 2021 | 12,465 | | 2020 | 12,310 | | 2019 | 11,781 | | 2018 | 10,903 | | 2017 | 9,860 | | 2016 | 8,864 | | 2015 | 8,101 | | 2014 | 7,679 | | 2013 | 7,610 | | 2012 | 7,789 | | 2011 | 8,034 | | 2010 | 8,069 | | 2009 | 7,789 | | 2008 | 7,337 | | 2007 | 6,832 | | 2006 | 6,369 | | 2005 | 5,999 | | 2004 | 5,727 | | 2003 | 5,509 | | 2002 | 5,293 | | 2001 | 5,053 | | 2000 | 4,777 | | 1999 | 4,571 | | 1998 | 4,451 | | 1997 | 4,334 | | 1996 | 4,224 | | 1995 | 4,123 | | 1994 | 4,029 | | 1993 | 3,940 | | 1992 | 3,853 | | 1991 | 3,769 | | 1990 | 3,688 | | 1989 | 3,609 | | 1988 | 3,534 | | 1987 | 3,459 | | 1986 | 3,381 | | 1985 | 3,295 | | 1984 | 3,202 | | 1983 | 3,100 | | 1982 | 2,955 | | 1981 | 2,786 | | 1980 | 2,663 | | 1979 | 2,602 | | 1978 | 2,598 | | 1977 | 2,630 | | 1976 | 2,704 | | 1975 | 2,802 | | 1974 | 2,899 | | 1973 | 2,997 | | 1972 | 3,092 | | 1971 | 3,180 | | 1970 | 3,252 | | 1969 | 3,295 | | 1968 | 3,286 | | 1967 | 3,248 | | 1966 | 3,218 | | 1965 | 3,195 | | 1964 | 3,175 | | 1963 | 3,159 | | 1962 | 3,148 | | 1961 | 3,135 | | 1960 | 3,124 |
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