| Year | Value | | 2022 | 15,857 | | 2021 | 15,392 | | 2020 | 14,960 | | 2019 | 14,503 | | 2018 | 13,975 | | 2017 | 13,402 | | 2016 | 12,795 | | 2015 | 12,158 | | 2014 | 11,550 | | 2013 | 11,011 | | 2012 | 10,515 | | 2011 | 10,047 | | 2010 | 9,606 | | 2009 | 9,181 | | 2008 | 8,793 | | 2007 | 8,431 | | 2006 | 8,057 | | 2005 | 7,693 | | 2004 | 7,378 | | 2003 | 7,108 | | 2002 | 6,885 | | 2001 | 6,735 | | 2000 | 6,623 | | 1999 | 6,504 | | 1998 | 6,363 | | 1997 | 6,201 | | 1996 | 6,023 | | 1995 | 5,840 | | 1994 | 5,644 | | 1993 | 5,429 | | 1992 | 5,211 | | 1991 | 5,002 | | 1990 | 4,803 | | 1989 | 4,623 | | 1988 | 4,465 | | 1987 | 4,321 | | 1986 | 4,190 | | 1985 | 4,068 | | 1984 | 3,944 | | 1983 | 3,818 | | 1982 | 3,694 | | 1981 | 3,573 | | 1980 | 3,452 | | 1979 | 3,336 | | 1978 | 3,230 | | 1977 | 3,128 | | 1976 | 3,030 | | 1975 | 2,953 | | 1974 | 2,904 | | 1973 | 2,870 | | 1972 | 2,846 | | 1971 | 2,827 | | 1970 | 2,777 | | 1969 | 2,692 | | 1968 | 2,596 | | 1967 | 2,498 | | 1966 | 2,398 | | 1965 | 2,301 | | 1964 | 2,208 | | 1963 | 2,121 | | 1962 | 2,043 | | 1961 | 1,971 | | 1960 | 1,907 |
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