| Year | Value | | 2022 | 3,279 | | 2021 | 3,262 | | 2020 | 3,226 | | 2019 | 3,106 | | 2018 | 2,972 | | 2017 | 2,870 | | 2016 | 2,764 | | 2015 | 2,615 | | 2014 | 2,404 | | 2013 | 2,235 | | 2012 | 2,149 | | 2011 | 2,077 | | 2010 | 1,984 | | 2009 | 1,878 | | 2008 | 1,770 | | 2007 | 1,666 | | 2006 | 1,576 | | 2005 | 1,490 | | 2004 | 1,410 | | 2003 | 1,335 | | 2002 | 1,260 | | 2001 | 1,185 | | 2000 | 1,111 | | 1999 | 1,041 | | 1998 | 974 | | 1997 | 915 | | 1996 | 867 | | 1995 | 829 | | 1994 | 802 | | 1993 | 779 | | 1992 | 756 | | 1991 | 737 | | 1990 | 719 | | 1989 | 699 | | 1988 | 677 | | 1987 | 652 | | 1986 | 628 | | 1985 | 603 | | 1984 | 585 | | 1983 | 574 | | 1982 | 564 | | 1981 | 548 | | 1980 | 528 | | 1979 | 506 | | 1978 | 486 | | 1977 | 466 | | 1976 | 445 | | 1975 | 423 | | 1974 | 396 | | 1973 | 366 | | 1972 | 334 | | 1971 | 301 | | 1970 | 266 | | 1969 | 236 | | 1968 | 215 | | 1967 | 201 | | 1966 | 192 | | 1965 | 187 | | 1964 | 189 | | 1963 | 193 | | 1962 | 196 | | 1961 | 197 | | 1960 | 196 |
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