| Year | Value | | 2022 | 2,647 | | 2021 | 2,615 | | 2020 | 2,597 | | 2019 | 2,609 | | 2018 | 2,647 | | 2017 | 2,701 | | 2016 | 2,775 | | 2015 | 2,853 | | 2014 | 2,963 | | 2013 | 3,117 | | 2012 | 3,222 | | 2011 | 3,253 | | 2010 | 3,256 | | 2009 | 3,219 | | 2008 | 3,148 | | 2007 | 3,120 | | 2006 | 3,154 | | 2005 | 3,237 | | 2004 | 3,309 | | 2003 | 3,348 | | 2002 | 3,410 | | 2001 | 3,478 | | 2000 | 3,502 | | 1999 | 3,515 | | 1998 | 3,529 | | 1997 | 3,485 | | 1996 | 3,387 | | 1995 | 3,302 | | 1994 | 3,250 | | 1993 | 3,204 | | 1992 | 3,180 | | 1991 | 3,209 | | 1990 | 3,232 | | 1989 | 3,215 | | 1988 | 3,218 | | 1987 | 3,234 | | 1986 | 3,251 | | 1985 | 3,276 | | 1984 | 3,346 | | 1983 | 3,418 | | 1982 | 3,477 | | 1981 | 3,535 | | 1980 | 3,545 | | 1979 | 3,501 | | 1978 | 3,467 | | 1977 | 3,466 | | 1976 | 3,491 | | 1975 | 3,570 | | 1974 | 3,738 | | 1973 | 3,971 | | 1972 | 4,209 | | 1971 | 4,444 | | 1970 | 4,664 | | 1969 | 4,763 | | 1968 | 4,748 | | 1967 | 4,727 | | 1966 | 4,692 | | 1965 | 4,627 | | 1964 | 4,511 | | 1963 | 4,407 | | 1962 | 4,344 | | 1961 | 4,281 | | 1960 | 4,213 |
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