Year | Value | 2022 | 19,705 | 2021 | 19,706 | 2020 | 19,637 | 2019 | 19,700 | 2018 | 19,461 | 2017 | 19,039 | 2016 | 18,934 | 2015 | 18,800 | 2014 | 18,621 | 2013 | 18,390 | 2012 | 18,071 | 2011 | 17,689 | 2010 | 17,258 | 2009 | 16,749 | 2008 | 16,199 | 2007 | 15,659 | 2006 | 15,177 | 2005 | 14,779 | 2004 | 14,450 | 2003 | 14,154 | 2002 | 13,863 | 2001 | 13,530 | 2000 | 13,112 | 1999 | 12,613 | 1998 | 12,080 | 1997 | 11,573 | 1996 | 11,150 | 1995 | 10,841 | 1994 | 10,650 | 1993 | 10,549 | 1992 | 10,507 | 1991 | 10,475 | 1990 | 10,454 | 1989 | 10,454 | 1988 | 10,455 | 1987 | 10,457 | 1986 | 10,466 | 1985 | 10,500 | 1984 | 10,575 | 1983 | 10,694 | 1982 | 10,851 | 1981 | 11,024 | 1980 | 11,191 | 1979 | 11,319 | 1978 | 11,382 | 1977 | 11,387 | 1976 | 11,329 | 1975 | 11,196 | 1974 | 10,994 | 1973 | 10,749 | 1972 | 10,502 | 1971 | 10,303 | 1970 | 10,198 | 1969 | 10,227 | 1968 | 10,379 | 1967 | 10,582 | 1966 | 10,758 | 1965 | 10,830 | 1964 | 10,742 | 1963 | 10,502 | 1962 | 10,169 | 1961 | 9,813 | 1960 | 9,482 |
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