| Year | Value | | 2022 | 1,680 | | 2021 | 1,646 | | 2020 | 1,593 | | 2019 | 1,516 | | 2018 | 1,434 | | 2017 | 1,351 | | 2016 | 1,263 | | 2015 | 1,173 | | 2014 | 1,083 | | 2013 | 995 | | 2012 | 913 | | 2011 | 847 | | 2010 | 783 | | 2009 | 719 | | 2008 | 668 | | 2007 | 640 | | 2006 | 636 | | 2005 | 639 | | 2004 | 642 | | 2003 | 643 | | 2002 | 644 | | 2001 | 652 | | 2000 | 661 | | 1999 | 664 | | 1998 | 659 | | 1997 | 639 | | 1996 | 610 | | 1995 | 594 | | 1994 | 595 | | 1993 | 591 | | 1992 | 574 | | 1991 | 581 | | 1990 | 608 | | 1989 | 612 | | 1988 | 588 | | 1987 | 545 | | 1986 | 496 | | 1985 | 452 | | 1984 | 413 | | 1983 | 376 | | 1982 | 344 | | 1981 | 304 | | 1980 | 273 | | 1979 | 260 | | 1978 | 246 | | 1977 | 231 | | 1976 | 217 | | 1975 | 204 | | 1974 | 189 | | 1973 | 176 | | 1972 | 162 | | 1971 | 149 | | 1970 | 137 | | 1969 | 126 | | 1968 | 115 | | 1967 | 103 | | 1966 | 94 | | 1965 | 83 | | 1964 | 73 | | 1963 | 64 | | 1962 | 58 | | 1961 | 53 | | 1960 | 49 |
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