| Year | Value | | 2022 | 10,167 | | 2021 | 9,590 | | 2020 | 9,019 | | 2019 | 8,451 | | 2018 | 7,923 | | 2017 | 7,478 | | 2016 | 7,115 | | 2015 | 6,831 | | 2014 | 6,615 | | 2013 | 6,460 | | 2012 | 6,358 | | 2011 | 6,297 | | 2010 | 6,270 | | 2009 | 6,266 | | 2008 | 6,277 | | 2007 | 6,295 | | 2006 | 6,320 | | 2005 | 6,353 | | 2004 | 6,390 | | 2003 | 6,427 | | 2002 | 6,462 | | 2001 | 6,490 | | 2000 | 6,510 | | 1999 | 6,524 | | 1998 | 6,533 | | 1997 | 6,537 | | 1996 | 6,535 | | 1995 | 6,522 | | 1994 | 6,500 | | 1993 | 6,473 | | 1992 | 6,468 | | 1991 | 6,522 | | 1990 | 6,490 | | 1989 | 6,331 | | 1988 | 6,161 | | 1987 | 5,981 | | 1986 | 5,792 | | 1985 | 5,595 | | 1984 | 5,402 | | 1983 | 5,222 | | 1982 | 5,058 | | 1981 | 4,911 | | 1980 | 4,773 | | 1979 | 4,761 | | 1978 | 4,770 | | 1977 | 4,613 | | 1976 | 4,369 | | 1975 | 4,108 | | 1974 | 3,884 | | 1973 | 3,848 | | 1972 | 3,982 | | 1971 | 4,104 | | 1970 | 4,153 | | 1969 | 4,143 | | 1968 | 4,069 | | 1967 | 3,926 | | 1966 | 3,798 | | 1965 | 3,731 | | 1964 | 3,709 | | 1963 | 3,706 | | 1962 | 3,713 | | 1961 | 3,720 | | 1960 | 3,700 |
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