| Year | Value | | 2022 | 1,463 | | 2021 | 1,403 | | 2020 | 1,339 | | 2019 | 1,275 | | 2018 | 1,214 | | 2017 | 1,159 | | 2016 | 1,127 | | 2015 | 1,122 | | 2014 | 1,140 | | 2013 | 1,171 | | 2012 | 1,212 | | 2011 | 1,253 | | 2010 | 1,281 | | 2009 | 1,294 | | 2008 | 1,297 | | 2007 | 1,294 | | 2006 | 1,285 | | 2005 | 1,274 | | 2004 | 1,261 | | 2003 | 1,247 | | 2002 | 1,219 | | 2001 | 1,182 | | 2000 | 1,121 | | 1999 | 1,039 | | 1998 | 962 | | 1997 | 897 | | 1996 | 846 | | 1995 | 808 | | 1994 | 782 | | 1993 | 761 | | 1992 | 747 | | 1991 | 737 | | 1990 | 733 | | 1989 | 737 | | 1988 | 744 | | 1987 | 749 | | 1986 | 755 | | 1985 | 763 | | 1984 | 770 | | 1983 | 778 | | 1982 | 785 | | 1981 | 787 | | 1980 | 783 | | 1979 | 777 | | 1978 | 764 | | 1977 | 744 | | 1976 | 714 | | 1975 | 676 | | 1974 | 636 | | 1973 | 600 | | 1972 | 567 | | 1971 | 538 | | 1970 | 516 | | 1969 | 506 | | 1968 | 504 | | 1967 | 502 | | 1966 | 499 | | 1965 | 496 | | 1964 | 488 | | 1963 | 476 | | 1962 | 464 | | 1961 | 452 | | 1960 | 440 |
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