| Year | Value | | 2022 | 1,175 | | 2021 | 1,151 | | 2020 | 1,122 | | 2019 | 1,098 | | 2018 | 1,081 | | 2017 | 1,069 | | 2016 | 1,063 | | 2015 | 1,058 | | 2014 | 1,058 | | 2013 | 1,065 | | 2012 | 1,069 | | 2011 | 1,060 | | 2010 | 1,039 | | 2009 | 1,018 | | 2008 | 995 | | 2007 | 972 | | 2006 | 934 | | 2005 | 875 | | 2004 | 801 | | 2003 | 719 | | 2002 | 635 | | 2001 | 577 | | 2000 | 544 | | 1999 | 520 | | 1998 | 506 | | 1997 | 496 | | 1996 | 492 | | 1995 | 485 | | 1994 | 479 | | 1993 | 475 | | 1992 | 470 | | 1991 | 467 | | 1990 | 467 | | 1989 | 462 | | 1988 | 450 | | 1987 | 432 | | 1986 | 425 | | 1985 | 436 | | 1984 | 441 | | 1983 | 436 | | 1982 | 423 | | 1981 | 416 | | 1980 | 421 | | 1979 | 425 | | 1978 | 420 | | 1977 | 409 | | 1976 | 389 | | 1975 | 368 | | 1974 | 352 | | 1973 | 338 | | 1972 | 324 | | 1971 | 312 | | 1970 | 301 | | 1969 | 293 | | 1968 | 286 | | 1967 | 284 | | 1966 | 292 | | 1965 | 312 | | 1964 | 341 | | 1963 | 383 | | 1962 | 437 | | 1961 | 443 | | 1960 | 410 |
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