| Year | Value | | 2022 | 2,862 | | 2021 | 2,835 | | 2020 | 2,816 | | 2019 | 2,756 | | 2018 | 2,637 | | 2017 | 2,488 | | 2016 | 2,316 | | 2015 | 2,125 | | 2014 | 1,925 | | 2013 | 1,768 | | 2012 | 1,655 | | 2011 | 1,542 | | 2010 | 1,436 | | 2009 | 1,331 | | 2008 | 1,236 | | 2007 | 1,160 | | 2006 | 1,091 | | 2005 | 1,009 | | 2004 | 922 | | 2003 | 850 | | 2002 | 789 | | 2001 | 741 | | 2000 | 708 | | 1999 | 695 | | 1998 | 696 | | 1997 | 704 | | 1996 | 722 | | 1995 | 741 | | 1994 | 723 | | 1993 | 675 | | 1992 | 643 | | 1991 | 623 | | 1990 | 608 | | 1989 | 575 | | 1988 | 532 | | 1987 | 498 | | 1986 | 467 | | 1985 | 440 | | 1984 | 412 | | 1983 | 389 | | 1982 | 374 | | 1981 | 365 | | 1980 | 362 | | 1979 | 368 | | 1978 | 383 | | 1977 | 368 | | 1976 | 325 | | 1975 | 290 | | 1974 | 257 | | 1973 | 226 | | 1972 | 197 | | 1971 | 177 | | 1970 | 167 | | 1969 | 163 | | 1968 | 165 | | 1967 | 174 | | 1966 | 180 | | 1965 | 172 | | 1964 | 165 | | 1963 | 163 | | 1962 | 160 | | 1961 | 159 | | 1960 | 158 |
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