| Year | Value | | 2022 | 4,477 | | 2021 | 4,584 | | 2020 | 4,652 | | 2019 | 4,697 | | 2018 | 4,779 | | 2017 | 4,893 | | 2016 | 5,039 | | 2015 | 5,219 | | 2014 | 5,423 | | 2013 | 5,625 | | 2012 | 5,796 | | 2011 | 5,915 | | 2010 | 5,983 | | 2009 | 5,985 | | 2008 | 5,902 | | 2007 | 5,742 | | 2006 | 5,510 | | 2005 | 5,217 | | 2004 | 4,880 | | 2003 | 4,527 | | 2002 | 4,246 | | 2001 | 4,040 | | 2000 | 3,908 | | 1999 | 3,897 | | 1998 | 3,961 | | 1997 | 4,040 | | 1996 | 4,085 | | 1995 | 4,077 | | 1994 | 4,030 | | 1993 | 3,975 | | 1992 | 3,953 | | 1991 | 3,994 | | 1990 | 4,173 | | 1989 | 4,488 | | 1988 | 4,852 | | 1987 | 5,197 | | 1986 | 5,451 | | 1985 | 5,582 | | 1984 | 5,578 | | 1983 | 5,448 | | 1982 | 5,243 | | 1981 | 5,026 | | 1980 | 4,882 | | 1979 | 4,828 | | 1978 | 4,784 | | 1977 | 4,707 | | 1976 | 4,592 | | 1975 | 4,452 | | 1974 | 4,307 | | 1973 | 4,168 | | 1972 | 4,038 | | 1971 | 3,909 | | 1970 | 3,773 | | 1969 | 3,647 | | 1968 | 3,542 | | 1967 | 3,458 | | 1966 | 3,404 | | 1965 | 3,391 | | 1964 | 3,419 | | 1963 | 3,478 | | 1962 | 3,552 | | 1961 | 3,623 | | 1960 | 3,666 |
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