| Year | Value | | 2022 | 19,039 | | 2021 | 18,837 | | 2020 | 18,607 | | 2019 | 18,240 | | 2018 | 17,717 | | 2017 | 17,160 | | 2016 | 16,586 | | 2015 | 15,994 | | 2014 | 15,388 | | 2013 | 14,771 | | 2012 | 14,156 | | 2011 | 13,558 | | 2010 | 12,979 | | 2009 | 12,499 | | 2008 | 12,114 | | 2007 | 11,767 | | 2006 | 11,466 | | 2005 | 11,194 | | 2004 | 10,955 | | 2003 | 10,726 | | 2002 | 10,450 | | 2001 | 10,136 | | 2000 | 9,790 | | 1999 | 9,392 | | 1998 | 8,978 | | 1997 | 8,585 | | 1996 | 8,228 | | 1995 | 7,940 | | 1994 | 7,740 | | 1993 | 7,592 | | 1992 | 7,454 | | 1991 | 7,329 | | 1990 | 7,260 | | 1989 | 7,197 | | 1988 | 7,058 | | 1987 | 6,842 | | 1986 | 6,563 | | 1985 | 6,237 | | 1984 | 5,884 | | 1983 | 5,539 | | 1982 | 5,220 | | 1981 | 4,913 | | 1980 | 4,634 | | 1979 | 4,408 | | 1978 | 4,204 | | 1977 | 3,986 | | 1976 | 3,767 | | 1975 | 3,570 | | 1974 | 3,411 | | 1973 | 3,294 | | 1972 | 3,214 | | 1971 | 3,164 | | 1970 | 3,133 | | 1969 | 3,130 | | 1968 | 3,148 | | 1967 | 3,153 | | 1966 | 3,135 | | 1965 | 3,100 | | 1964 | 3,059 | | 1963 | 3,026 | | 1962 | 2,998 | | 1961 | 2,975 | | 1960 | 2,952 |
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