| Year | Value | | 2022 | 39,009 | | 2021 | 36,900 | | 2020 | 34,395 | | 2019 | 31,760 | | 2018 | 28,957 | | 2017 | 26,217 | | 2016 | 23,626 | | 2015 | 21,193 | | 2014 | 19,010 | | 2013 | 17,121 | | 2012 | 15,527 | | 2011 | 14,207 | | 2010 | 13,085 | | 2009 | 12,090 | | 2008 | 11,203 | | 2007 | 10,416 | | 2006 | 9,761 | | 2005 | 9,354 | | 2004 | 9,120 | | 2003 | 8,903 | | 2002 | 8,708 | | 2001 | 8,533 | | 2000 | 8,349 | | 1999 | 8,111 | | 1998 | 7,785 | | 1997 | 7,377 | | 1996 | 6,919 | | 1995 | 6,450 | | 1994 | 6,028 | | 1993 | 5,646 | | 1992 | 5,280 | | 1991 | 4,943 | | 1990 | 4,645 | | 1989 | 4,406 | | 1988 | 4,223 | | 1987 | 4,078 | | 1986 | 3,967 | | 1985 | 3,896 | | 1984 | 3,898 | | 1983 | 3,959 | | 1982 | 4,025 | | 1981 | 4,086 | | 1980 | 4,137 | | 1979 | 4,170 | | 1978 | 4,190 | | 1977 | 4,212 | | 1976 | 4,247 | | 1975 | 4,288 | | 1974 | 4,317 | | 1973 | 4,316 | | 1972 | 4,297 | | 1971 | 4,267 | | 1970 | 4,230 | | 1969 | 4,185 | | 1968 | 4,130 | | 1967 | 4,020 | | 1966 | 3,793 | | 1965 | 3,503 | | 1964 | 3,322 | | 1963 | 3,256 | | 1962 | 3,202 | | 1961 | 3,150 | | 1960 | 3,090 |
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