| Year | Value | | 2022 | 1,077 | | 2021 | 1,076 | | 2020 | 1,082 | | 2019 | 1,090 | | 2018 | 1,093 | | 2017 | 1,087 | | 2016 | 1,073 | | 2015 | 1,052 | | 2014 | 1,026 | | 2013 | 1,001 | | 2012 | 981 | | 2011 | 965 | | 2010 | 948 | | 2009 | 939 | | 2008 | 931 | | 2007 | 920 | | 2006 | 919 | | 2005 | 930 | | 2004 | 941 | | 2003 | 945 | | 2002 | 939 | | 2001 | 909 | | 2000 | 861 | | 1999 | 801 | | 1998 | 735 | | 1997 | 671 | | 1996 | 615 | | 1995 | 574 | | 1994 | 548 | | 1993 | 531 | | 1992 | 523 | | 1991 | 523 | | 1990 | 525 | | 1989 | 531 | | 1988 | 547 | | 1987 | 565 | | 1986 | 562 | | 1985 | 542 | | 1984 | 533 | | 1983 | 541 | | 1982 | 561 | | 1981 | 561 | | 1980 | 538 | | 1979 | 522 | | 1978 | 525 | | 1977 | 545 | | 1976 | 546 | | 1975 | 511 | | 1974 | 474 | | 1973 | 458 | | 1972 | 453 | | 1971 | 447 | | 1970 | 438 | | 1969 | 425 | | 1968 | 409 | | 1967 | 393 | | 1966 | 371 | | 1965 | 347 | | 1964 | 332 | | 1963 | 321 | | 1962 | 313 | | 1961 | 300 | | 1960 | 283 |
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