| Year | Value | | 2022 | 12,659 | | 2021 | 12,405 | | 2020 | 12,131 | | 2019 | 11,876 | | 2018 | 11,436 | | 2017 | 10,787 | | 2016 | 10,350 | | 2015 | 10,361 | | 2014 | 10,483 | | 2013 | 10,595 | | 2012 | 10,787 | | 2011 | 10,915 | | 2010 | 11,031 | | 2009 | 11,352 | | 2008 | 11,655 | | 2007 | 11,709 | | 2006 | 11,409 | | 2005 | 10,832 | | 2004 | 10,379 | | 2003 | 10,186 | | 2002 | 10,005 | | 2001 | 9,691 | | 2000 | 9,452 | | 1999 | 9,296 | | 1998 | 9,017 | | 1997 | 8,745 | | 1996 | 8,567 | | 1995 | 8,319 | | 1994 | 8,009 | | 1993 | 7,711 | | 1992 | 7,385 | | 1991 | 6,985 | | 1990 | 6,506 | | 1989 | 6,069 | | 1988 | 5,723 | | 1987 | 5,445 | | 1986 | 5,279 | | 1985 | 5,226 | | 1984 | 5,240 | | 1983 | 5,268 | | 1982 | 5,305 | | 1981 | 5,412 | | 1980 | 5,590 | | 1979 | 5,731 | | 1978 | 5,808 | | 1977 | 5,838 | | 1976 | 5,780 | | 1975 | 5,675 | | 1974 | 5,562 | | 1973 | 5,466 | | 1972 | 5,380 | | 1971 | 5,336 | | 1970 | 5,332 | | 1969 | 5,267 | | 1968 | 5,158 | | 1967 | 5,058 | | 1966 | 4,932 | | 1965 | 4,778 | | 1964 | 4,693 | | 1963 | 4,644 | | 1962 | 4,575 | | 1961 | 4,477 | | 1960 | 4,388 |
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