| Year | Value | | 2022 | 1,144 | | 2021 | 1,128 | | 2020 | 1,115 | | 2019 | 1,070 | | 2018 | 1,093 | | 2017 | 1,141 | | 2016 | 1,101 | | 2015 | 1,055 | | 2014 | 1,010 | | 2013 | 966 | | 2012 | 930 | | 2011 | 905 | | 2010 | 879 | | 2009 | 854 | | 2008 | 838 | | 2007 | 819 | | 2006 | 796 | | 2005 | 770 | | 2004 | 743 | | 2003 | 724 | | 2002 | 700 | | 2001 | 687 | | 2000 | 695 | | 1999 | 703 | | 1998 | 708 | | 1997 | 708 | | 1996 | 701 | | 1995 | 695 | | 1994 | 693 | | 1993 | 691 | | 1992 | 687 | | 1991 | 682 | | 1990 | 671 | | 1989 | 656 | | 1988 | 638 | | 1987 | 617 | | 1986 | 589 | | 1985 | 558 | | 1984 | 522 | | 1983 | 489 | | 1982 | 458 | | 1981 | 429 | | 1980 | 410 | | 1979 | 391 | | 1978 | 374 | | 1977 | 361 | | 1976 | 346 | | 1975 | 334 | | 1974 | 319 | | 1973 | 303 | | 1972 | 296 | | 1971 | 290 | | 1970 | 282 | | 1969 | 279 | | 1968 | 278 | | 1967 | 280 | | 1966 | 287 | | 1965 | 294 | | 1964 | 299 | | 1963 | 303 | | 1962 | 306 | | 1961 | 307 | | 1960 | 309 |
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