| Year | Value | | 2022 | 47,732 | | 2021 | 47,209 | | 2020 | 46,583 | | 2019 | 45,827 | | 2018 | 44,964 | | 2017 | 44,054 | | 2016 | 43,117 | | 2015 | 42,146 | | 2014 | 41,191 | | 2013 | 40,312 | | 2012 | 39,528 | | 2011 | 38,849 | | 2010 | 38,277 | | 2009 | 37,763 | | 2008 | 37,228 | | 2007 | 36,692 | | 2006 | 36,094 | | 2005 | 35,657 | | 2004 | 35,488 | | 2003 | 35,293 | | 2002 | 34,538 | | 2001 | 33,108 | | 2000 | 31,596 | | 1999 | 30,074 | | 1998 | 28,324 | | 1997 | 26,291 | | 1996 | 24,644 | | 1995 | 23,704 | | 1994 | 23,197 | | 1993 | 22,497 | | 1992 | 22,721 | | 1991 | 22,738 | | 1990 | 20,715 | | 1989 | 18,553 | | 1988 | 17,037 | | 1987 | 15,855 | | 1986 | 14,768 | | 1985 | 13,851 | | 1984 | 13,118 | | 1983 | 12,541 | | 1982 | 12,042 | | 1981 | 11,540 | | 1980 | 11,010 | | 1979 | 10,471 | | 1978 | 9,894 | | 1977 | 9,259 | | 1976 | 8,623 | | 1975 | 8,025 | | 1974 | 7,437 | | 1973 | 6,873 | | 1972 | 6,368 | | 1971 | 5,916 | | 1970 | 5,514 | | 1969 | 5,153 | | 1968 | 4,849 | | 1967 | 4,598 | | 1966 | 4,359 | | 1965 | 4,128 | | 1964 | 3,908 | | 1963 | 3,706 | | 1962 | 3,528 | | 1961 | 3,379 | | 1960 | 3,250 |
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