| Year | Value | | 2022 | 35,379 | | 2021 | 34,803 | | 2020 | 34,112 | | 2019 | 33,069 | | 2018 | 31,849 | | 2017 | 30,678 | | 2016 | 29,600 | | 2015 | 28,616 | | 2014 | 27,730 | | 2013 | 26,947 | | 2012 | 26,213 | | 2011 | 25,500 | | 2010 | 24,857 | | 2009 | 24,262 | | 2008 | 23,686 | | 2007 | 23,152 | | 2006 | 22,640 | | 2005 | 22,107 | | 2004 | 21,575 | | 2003 | 21,054 | | 2002 | 20,531 | | 2001 | 19,996 | | 2000 | 19,432 | | 1999 | 18,878 | | 1998 | 18,353 | | 1997 | 17,867 | | 1996 | 17,394 | | 1995 | 16,884 | | 1994 | 16,357 | | 1993 | 15,824 | | 1992 | 15,276 | | 1991 | 14,715 | | 1990 | 14,149 | | 1989 | 13,594 | | 1988 | 13,052 | | 1987 | 12,499 | | 1986 | 11,916 | | 1985 | 11,294 | | 1984 | 10,646 | | 1983 | 10,003 | | 1982 | 9,377 | | 1981 | 8,783 | | 1980 | 8,223 | | 1979 | 7,687 | | 1978 | 7,186 | | 1977 | 6,731 | | 1976 | 6,309 | | 1975 | 5,909 | | 1974 | 5,533 | | 1973 | 5,182 | | 1972 | 4,853 | | 1971 | 4,541 | | 1970 | 4,254 | | 1969 | 3,991 | | 1968 | 3,755 | | 1967 | 3,537 | | 1966 | 3,329 | | 1965 | 3,127 | | 1964 | 2,924 | | 1963 | 2,714 | | 1962 | 2,495 | | 1961 | 2,264 | | 1960 | 2,019 |
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