| Year | Value | | 2022 | 38,002 | | 2021 | 37,386 | | 2020 | 36,876 | | 2019 | 36,423 | | 2018 | 35,980 | | 2017 | 35,523 | | 2016 | 35,026 | | 2015 | 34,463 | | 2014 | 33,814 | | 2013 | 33,075 | | 2012 | 32,256 | | 2011 | 31,362 | | 2010 | 30,397 | | 2009 | 29,365 | | 2008 | 28,285 | | 2007 | 27,204 | | 2006 | 26,109 | | 2005 | 25,143 | | 2004 | 24,378 | | 2003 | 23,669 | | 2002 | 22,746 | | 2001 | 21,563 | | 2000 | 20,427 | | 1999 | 19,362 | | 1998 | 18,243 | | 1997 | 17,038 | | 1996 | 16,072 | | 1995 | 15,492 | | 1994 | 15,179 | | 1993 | 14,743 | | 1992 | 14,934 | | 1991 | 15,042 | | 1990 | 13,898 | | 1989 | 12,769 | | 1988 | 12,129 | | 1987 | 11,681 | | 1986 | 11,220 | | 1985 | 10,767 | | 1984 | 10,301 | | 1983 | 9,850 | | 1982 | 9,439 | | 1981 | 9,013 | | 1980 | 8,512 | | 1979 | 7,923 | | 1978 | 7,270 | | 1977 | 6,607 | | 1976 | 5,985 | | 1975 | 5,445 | | 1974 | 4,999 | | 1973 | 4,635 | | 1972 | 4,318 | | 1971 | 4,032 | | 1970 | 3,778 | | 1969 | 3,546 | | 1968 | 3,345 | | 1967 | 3,174 | | 1966 | 3,008 | | 1965 | 2,845 | | 1964 | 2,691 | | 1963 | 2,551 | | 1962 | 2,427 | | 1961 | 2,323 | | 1960 | 2,235 |
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