| Year | Value | | 2022 | 3,034 | | 2021 | 3,052 | | 2020 | 3,073 | | 2019 | 3,102 | | 2018 | 3,139 | | 2017 | 3,189 | | 2016 | 3,247 | | 2015 | 3,311 | | 2014 | 3,377 | | 2013 | 3,436 | | 2012 | 3,491 | | 2011 | 3,538 | | 2010 | 3,571 | | 2009 | 3,611 | | 2008 | 3,664 | | 2007 | 3,719 | | 2006 | 3,776 | | 2005 | 3,826 | | 2004 | 3,841 | | 2003 | 3,823 | | 2002 | 3,792 | | 2001 | 3,755 | | 2000 | 3,686 | | 1999 | 3,593 | | 1998 | 3,524 | | 1997 | 3,487 | | 1996 | 3,476 | | 1995 | 3,517 | | 1994 | 3,596 | | 1993 | 3,666 | | 1992 | 3,739 | | 1991 | 3,829 | | 1990 | 3,896 | | 1989 | 3,827 | | 1988 | 3,836 | | 1987 | 3,778 | | 1986 | 3,607 | | 1985 | 3,406 | | 1984 | 3,229 | | 1983 | 3,043 | | 1982 | 2,885 | | 1981 | 2,788 | | 1980 | 2,698 | | 1979 | 2,527 | | 1978 | 2,480 | | 1977 | 2,384 | | 1976 | 2,436 | | 1975 | 2,386 | | 1974 | 2,273 | | 1973 | 2,130 | | 1972 | 1,946 | | 1971 | 1,838 | | 1970 | 1,663 | | 1969 | 1,583 | | 1968 | 1,474 | | 1967 | 1,322 | | 1966 | 1,278 | | 1965 | 1,255 | | 1964 | 1,227 | | 1963 | 1,233 | | 1962 | 1,122 | | 1961 | 1,141 | | 1960 | 995 |
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