| Year | Value | | 2022 | 1,170 | | 2021 | 1,155 | | 2020 | 1,159 | | 2019 | 1,184 | | 2018 | 1,223 | | 2017 | 1,266 | | 2016 | 1,301 | | 2015 | 1,322 | | 2014 | 1,331 | | 2013 | 1,330 | | 2012 | 1,320 | | 2011 | 1,310 | | 2010 | 1,299 | | 2009 | 1,281 | | 2008 | 1,262 | | 2007 | 1,237 | | 2006 | 1,203 | | 2005 | 1,157 | | 2004 | 1,107 | | 2003 | 1,057 | | 2002 | 1,004 | | 2001 | 960 | | 2000 | 939 | | 1999 | 926 | | 1998 | 915 | | 1997 | 905 | | 1996 | 893 | | 1995 | 876 | | 1994 | 856 | | 1993 | 840 | | 1992 | 829 | | 1991 | 817 | | 1990 | 813 | | 1989 | 818 | | 1988 | 828 | | 1987 | 839 | | 1986 | 846 | | 1985 | 847 | | 1984 | 848 | | 1983 | 840 | | 1982 | 825 | | 1981 | 810 | | 1980 | 797 | | 1979 | 787 | | 1978 | 780 | | 1977 | 775 | | 1976 | 764 | | 1975 | 742 | | 1974 | 716 | | 1973 | 689 | | 1972 | 661 | | 1971 | 637 | | 1970 | 627 | | 1969 | 642 | | 1968 | 670 | | 1967 | 695 | | 1966 | 711 | | 1965 | 711 | | 1964 | 696 | | 1963 | 676 | | 1962 | 656 | | 1961 | 639 | | 1960 | 624 |
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