| Year | Value | | 2022 | 57,406 | | 2021 | 57,554 | | 2020 | 57,333 | | 2019 | 56,674 | | 2018 | 55,567 | | 2017 | 54,119 | | 2016 | 52,672 | | 2015 | 51,457 | | 2014 | 50,494 | | 2013 | 49,760 | | 2012 | 49,188 | | 2011 | 48,613 | | 2010 | 47,925 | | 2009 | 47,099 | | 2008 | 46,159 | | 2007 | 45,199 | | 2006 | 44,176 | | 2005 | 43,260 | | 2004 | 42,632 | | 2003 | 42,199 | | 2002 | 41,599 | | 2001 | 40,683 | | 2000 | 39,778 | | 1999 | 38,893 | | 1998 | 37,822 | | 1997 | 36,454 | | 1996 | 35,194 | | 1995 | 34,350 | | 1994 | 33,979 | | 1993 | 33,261 | | 1992 | 33,854 | | 1991 | 34,075 | | 1990 | 31,198 | | 1989 | 28,051 | | 1988 | 25,824 | | 1987 | 24,055 | | 1986 | 22,399 | | 1985 | 20,988 | | 1984 | 19,857 | | 1983 | 18,956 | | 1982 | 18,163 | | 1981 | 17,328 | | 1980 | 16,343 | | 1979 | 15,176 | | 1978 | 13,873 | | 1977 | 12,544 | | 1976 | 11,312 | | 1975 | 10,244 | | 1974 | 9,357 | | 1973 | 8,632 | | 1972 | 8,010 | | 1971 | 7,445 | | 1970 | 6,963 | | 1969 | 6,612 | | 1968 | 6,409 | | 1967 | 6,276 | | 1966 | 6,132 | | 1965 | 5,971 | | 1964 | 5,732 | | 1963 | 5,422 | | 1962 | 5,130 | | 1961 | 4,886 | | 1960 | 4,673 |
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