| Year | Value | | 2022 | 2,686 | | 2021 | 2,638 | | 2020 | 2,592 | | 2019 | 2,469 | | 2018 | 2,490 | | 2017 | 2,562 | | 2016 | 2,435 | | 2015 | 2,309 | | 2014 | 2,201 | | 2013 | 2,110 | | 2012 | 2,037 | | 2011 | 1,969 | | 2010 | 1,887 | | 2009 | 1,810 | | 2008 | 1,744 | | 2007 | 1,677 | | 2006 | 1,608 | | 2005 | 1,537 | | 2004 | 1,472 | | 2003 | 1,425 | | 2002 | 1,380 | | 2001 | 1,359 | | 2000 | 1,379 | | 1999 | 1,397 | | 1998 | 1,406 | | 1997 | 1,382 | | 1996 | 1,319 | | 1995 | 1,247 | | 1994 | 1,186 | | 1993 | 1,138 | | 1992 | 1,109 | | 1991 | 1,112 | | 1990 | 1,138 | | 1989 | 1,176 | | 1988 | 1,219 | | 1987 | 1,243 | | 1986 | 1,234 | | 1985 | 1,197 | | 1984 | 1,140 | | 1983 | 1,076 | | 1982 | 1,019 | | 1981 | 979 | | 1980 | 960 | | 1979 | 957 | | 1978 | 965 | | 1977 | 974 | | 1976 | 966 | | 1975 | 953 | | 1974 | 929 | | 1973 | 895 | | 1972 | 873 | | 1971 | 847 | | 1970 | 811 | | 1969 | 785 | | 1968 | 765 | | 1967 | 747 | | 1966 | 736 | | 1965 | 729 | | 1964 | 719 | | 1963 | 709 | | 1962 | 702 | | 1961 | 703 | | 1960 | 715 |
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