| Year | Value | | 2022 | 1,437 | | 2021 | 1,431 | | 2020 | 1,409 | | 2019 | 1,375 | | 2018 | 1,335 | | 2017 | 1,293 | | 2016 | 1,255 | | 2015 | 1,228 | | 2014 | 1,216 | | 2013 | 1,210 | | 2012 | 1,204 | | 2011 | 1,195 | | 2010 | 1,181 | | 2009 | 1,160 | | 2008 | 1,134 | | 2007 | 1,105 | | 2006 | 1,076 | | 2005 | 1,050 | | 2004 | 1,025 | | 2003 | 1,002 | | 2002 | 982 | | 2001 | 971 | | 2000 | 969 | | 1999 | 964 | | 1998 | 955 | | 1997 | 941 | | 1996 | 925 | | 1995 | 908 | | 1994 | 891 | | 1993 | 876 | | 1992 | 862 | | 1991 | 849 | | 1990 | 846 | | 1989 | 854 | | 1988 | 865 | | 1987 | 873 | | 1986 | 880 | | 1985 | 883 | | 1984 | 879 | | 1983 | 870 | | 1982 | 857 | | 1981 | 838 | | 1980 | 812 | | 1979 | 783 | | 1978 | 750 | | 1977 | 715 | | 1976 | 679 | | 1975 | 642 | | 1974 | 606 | | 1973 | 571 | | 1972 | 538 | | 1971 | 505 | | 1970 | 472 | | 1969 | 437 | | 1968 | 400 | | 1967 | 366 | | 1966 | 337 | | 1965 | 314 | | 1964 | 301 | | 1963 | 296 | | 1962 | 297 | | 1961 | 302 | | 1960 | 309 |
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