| Year | Value | | 2022 | 1,969 | | 2021 | 1,777 | | 2020 | 1,622 | | 2019 | 1,509 | | 2018 | 1,447 | | 2017 | 1,429 | | 2016 | 1,425 | | 2015 | 1,420 | | 2014 | 1,405 | | 2013 | 1,370 | | 2012 | 1,318 | | 2011 | 1,254 | | 2010 | 1,181 | | 2009 | 1,119 | | 2008 | 1,073 | | 2007 | 1,030 | | 2006 | 988 | | 2005 | 946 | | 2004 | 907 | | 2003 | 866 | | 2002 | 817 | | 2001 | 766 | | 2000 | 725 | | 1999 | 690 | | 1998 | 655 | | 1997 | 628 | | 1996 | 611 | | 1995 | 590 | | 1994 | 565 | | 1993 | 538 | | 1992 | 506 | | 1991 | 477 | | 1990 | 451 | | 1989 | 422 | | 1988 | 392 | | 1987 | 368 | | 1986 | 344 | | 1985 | 325 | | 1984 | 309 | | 1983 | 295 | | 1982 | 287 | | 1981 | 290 | | 1980 | 284 | | 1979 | 264 | | 1978 | 249 | | 1977 | 228 | | 1976 | 198 | | 1975 | 173 | | 1974 | 157 | | 1973 | 147 | | 1972 | 140 | | 1971 | 140 | | 1970 | 143 | | 1969 | 142 | | 1968 | 136 | | 1967 | 129 | | 1966 | 119 | | 1965 | 111 | | 1964 | 102 | | 1963 | 94 | | 1962 | 84 | | 1961 | 73 | | 1960 | 63 |
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