| Year | Value | | 2022 | 3,198 | | 2021 | 3,075 | | 2020 | 2,959 | | 2019 | 2,854 | | 2018 | 2,759 | | 2017 | 2,662 | | 2016 | 2,561 | | 2015 | 2,451 | | 2014 | 2,340 | | 2013 | 2,231 | | 2012 | 2,131 | | 2011 | 2,045 | | 2010 | 1,984 | | 2009 | 1,951 | | 2008 | 1,946 | | 2007 | 1,959 | | 2006 | 1,979 | | 2005 | 1,997 | | 2004 | 2,009 | | 2003 | 2,002 | | 2002 | 1,978 | | 2001 | 1,949 | | 2000 | 1,919 | | 1999 | 1,880 | | 1998 | 1,841 | | 1997 | 1,810 | | 1996 | 1,790 | | 1995 | 1,778 | | 1994 | 1,774 | | 1993 | 1,774 | | 1992 | 1,777 | | 1991 | 1,776 | | 1990 | 1,770 | | 1989 | 1,755 | | 1988 | 1,726 | | 1987 | 1,679 | | 1986 | 1,623 | | 1985 | 1,572 | | 1984 | 1,525 | | 1983 | 1,491 | | 1982 | 1,472 | | 1981 | 1,444 | | 1980 | 1,390 | | 1979 | 1,332 | | 1978 | 1,281 | | 1977 | 1,239 | | 1976 | 1,192 | | 1975 | 1,124 | | 1974 | 1,046 | | 1973 | 988 | | 1972 | 955 | | 1971 | 934 | | 1970 | 923 | | 1969 | 920 | | 1968 | 923 | | 1967 | 929 | | 1966 | 935 | | 1965 | 941 | | 1964 | 939 | | 1963 | 925 | | 1962 | 896 | | 1961 | 858 | | 1960 | 816 |
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