| Year | Value | | 2022 | 4,470 | | 2021 | 4,583 | | 2020 | 4,744 | | 2019 | 4,897 | | 2018 | 5,187 | | 2017 | 5,554 | | 2016 | 5,724 | | 2015 | 5,838 | | 2014 | 5,925 | | 2013 | 6,006 | | 2012 | 6,114 | | 2011 | 6,225 | | 2010 | 6,286 | | 2009 | 6,384 | | 2008 | 6,530 | | 2007 | 6,615 | | 2006 | 6,615 | | 2005 | 6,544 | | 2004 | 6,449 | | 2003 | 6,369 | | 2002 | 6,225 | | 2001 | 6,158 | | 2000 | 6,258 | | 1999 | 6,323 | | 1998 | 6,331 | | 1997 | 6,221 | | 1996 | 5,983 | | 1995 | 5,742 | | 1994 | 5,549 | | 1993 | 5,391 | | 1992 | 5,266 | | 1991 | 5,211 | | 1990 | 5,202 | | 1989 | 5,218 | | 1988 | 5,241 | | 1987 | 5,211 | | 1986 | 5,092 | | 1985 | 4,890 | | 1984 | 4,648 | | 1983 | 4,425 | | 1982 | 4,238 | | 1981 | 4,106 | | 1980 | 4,063 | | 1979 | 4,060 | | 1978 | 4,077 | | 1977 | 4,096 | | 1976 | 4,054 | | 1975 | 3,984 | | 1974 | 3,879 | | 1973 | 3,748 | | 1972 | 3,689 | | 1971 | 3,616 | | 1970 | 3,499 | | 1969 | 3,414 | | 1968 | 3,346 | | 1967 | 3,295 | | 1966 | 3,276 | | 1965 | 3,275 | | 1964 | 3,273 | | 1963 | 3,276 | | 1962 | 3,276 | | 1961 | 3,267 | | 1960 | 3,253 |
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