Year | Value | 2022 | 18,432 | 2021 | 17,609 | 2020 | 17,372 | 2019 | 16,831 | 2018 | 15,976 | 2017 | 15,278 | 2016 | 14,723 | 2015 | 14,157 | 2014 | 13,534 | 2013 | 13,029 | 2012 | 12,674 | 2011 | 12,440 | 2010 | 12,297 | 2009 | 12,323 | 2008 | 12,483 | 2007 | 12,698 | 2006 | 12,996 | 2005 | 13,438 | 2004 | 13,874 | 2003 | 14,226 | 2002 | 14,529 | 2001 | 14,702 | 2000 | 14,682 | 1999 | 14,526 | 1998 | 14,375 | 1997 | 14,170 | 1996 | 13,911 | 1995 | 13,767 | 1994 | 13,805 | 1993 | 13,903 | 1992 | 14,092 | 1991 | 14,414 | 1990 | 14,391 | 1989 | 14,322 | 1988 | 14,023 | 1987 | 13,383 | 1986 | 12,356 | 1985 | 11,215 | 1984 | 10,299 | 1983 | 9,759 | 1982 | 9,340 | 1981 | 9,150 | 1980 | 9,247 | 1979 | 9,361 | 1978 | 9,471 | 1977 | 9,565 | 1976 | 9,686 | 1975 | 9,692 | 1974 | 9,582 | 1973 | 9,491 | 1972 | 9,361 | 1971 | 9,250 | 1970 | 9,197 | 1969 | 9,236 | 1968 | 9,344 | 1967 | 9,438 | 1966 | 9,467 | 1965 | 9,416 | 1964 | 9,290 | 1963 | 9,096 | 1962 | 8,875 | 1961 | 8,650 | 1960 | 8,449 |
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