| Year | Value | | 2022 | 2,078 | | 2021 | 2,000 | | 2020 | 1,908 | | 2019 | 1,814 | | 2018 | 1,729 | | 2017 | 1,651 | | 2016 | 1,576 | | 2015 | 1,501 | | 2014 | 1,427 | | 2013 | 1,354 | | 2012 | 1,282 | | 2011 | 1,212 | | 2010 | 1,152 | | 2009 | 1,107 | | 2008 | 1,066 | | 2007 | 1,031 | | 2006 | 999 | | 2005 | 958 | | 2004 | 910 | | 2003 | 866 | | 2002 | 831 | | 2001 | 802 | | 2000 | 772 | | 1999 | 747 | | 1998 | 730 | | 1997 | 727 | | 1996 | 731 | | 1995 | 738 | | 1994 | 738 | | 1993 | 733 | | 1992 | 730 | | 1991 | 712 | | 1990 | 673 | | 1989 | 631 | | 1988 | 591 | | 1987 | 557 | | 1986 | 525 | | 1985 | 493 | | 1984 | 462 | | 1983 | 434 | | 1982 | 410 | | 1981 | 382 | | 1980 | 346 | | 1979 | 310 | | 1978 | 279 | | 1977 | 257 | | 1976 | 241 | | 1975 | 234 | | 1974 | 236 | | 1973 | 244 | | 1972 | 255 | | 1971 | 261 | | 1970 | 252 | | 1969 | 231 | | 1968 | 211 | | 1967 | 192 | | 1966 | 177 | | 1965 | 163 | | 1964 | 151 | | 1963 | 143 | | 1962 | 141 | | 1961 | 141 | | 1960 | 144 |
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