Year | Value | 2022 | 36,386 | 2021 | 36,879 | 2020 | 36,731 | 2019 | 35,937 | 2018 | 34,763 | 2017 | 33,355 | 2016 | 31,659 | 2015 | 29,704 | 2014 | 27,913 | 2013 | 26,240 | 2012 | 24,371 | 2011 | 22,846 | 2010 | 21,979 | 2009 | 21,327 | 2008 | 21,064 | 2007 | 21,330 | 2006 | 21,609 | 2005 | 21,750 | 2004 | 21,799 | 2003 | 21,670 | 2002 | 21,269 | 2001 | 20,892 | 2000 | 20,930 | 1999 | 21,287 | 1998 | 22,028 | 1997 | 23,122 | 1996 | 23,926 | 1995 | 24,171 | 1994 | 24,056 | 1993 | 23,611 | 1992 | 22,996 | 1991 | 22,261 | 1990 | 21,256 | 1989 | 19,982 | 1988 | 18,403 | 1987 | 16,630 | 1986 | 14,963 | 1985 | 13,488 | 1984 | 12,167 | 1983 | 10,955 | 1982 | 9,795 | 1981 | 8,722 | 1980 | 7,851 | 1979 | 7,096 | 1978 | 6,342 | 1977 | 5,670 | 1976 | 5,149 | 1975 | 4,823 | 1974 | 4,711 | 1973 | 4,803 | 1972 | 5,056 | 1971 | 5,414 | 1970 | 5,702 | 1969 | 5,857 | 1968 | 5,947 | 1967 | 5,974 | 1966 | 5,944 | 1965 | 5,918 | 1964 | 5,900 | 1963 | 5,881 | 1962 | 5,863 | 1961 | 5,817 | 1960 | 5,906 |
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