| Year | Value | | 2022 | 37,997 | | 2021 | 37,046 | | 2020 | 35,805 | | 2019 | 34,083 | | 2018 | 32,183 | | 2017 | 30,441 | | 2016 | 28,784 | | 2015 | 27,078 | | 2014 | 25,397 | | 2013 | 23,841 | | 2012 | 22,417 | | 2011 | 21,131 | | 2010 | 19,971 | | 2009 | 18,895 | | 2008 | 17,949 | | 2007 | 17,148 | | 2006 | 16,445 | | 2005 | 15,853 | | 2004 | 15,383 | | 2003 | 15,040 | | 2002 | 14,769 | | 2001 | 14,550 | | 2000 | 14,394 | | 1999 | 14,281 | | 1998 | 14,172 | | 1997 | 14,079 | | 1996 | 14,009 | | 1995 | 13,919 | | 1994 | 13,790 | | 1993 | 13,604 | | 1992 | 13,395 | | 1991 | 13,167 | | 1990 | 12,939 | | 1989 | 12,732 | | 1988 | 12,527 | | 1987 | 12,318 | | 1986 | 12,082 | | 1985 | 11,832 | | 1984 | 11,608 | | 1983 | 11,420 | | 1982 | 11,224 | | 1981 | 11,028 | | 1980 | 10,841 | | 1979 | 10,647 | | 1978 | 10,480 | | 1977 | 10,364 | | 1976 | 10,301 | | 1975 | 10,282 | | 1974 | 10,264 | | 1973 | 10,234 | | 1972 | 10,212 | | 1971 | 10,162 | | 1970 | 10,054 | | 1969 | 9,761 | | 1968 | 9,269 | | 1967 | 8,730 | | 1966 | 8,181 | | 1965 | 7,651 | | 1964 | 7,170 | | 1963 | 6,761 | | 1962 | 6,411 | | 1961 | 6,080 | | 1960 | 5,765 |
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