| Year | Value | | 2022 | 1,063 | | 2021 | 1,097 | | 2020 | 1,129 | | 2019 | 1,147 | | 2018 | 1,155 | | 2017 | 1,164 | | 2016 | 1,173 | | 2015 | 1,164 | | 2014 | 1,137 | | 2013 | 1,108 | | 2012 | 1,081 | | 2011 | 1,053 | | 2010 | 1,036 | | 2009 | 1,004 | | 2008 | 959 | | 2007 | 930 | | 2006 | 905 | | 2005 | 879 | | 2004 | 855 | | 2003 | 834 | | 2002 | 810 | | 2001 | 782 | | 2000 | 735 | | 1999 | 699 | | 1998 | 686 | | 1997 | 671 | | 1996 | 653 | | 1995 | 633 | | 1994 | 613 | | 1993 | 594 | | 1992 | 573 | | 1991 | 550 | | 1990 | 530 | | 1989 | 516 | | 1988 | 505 | | 1987 | 495 | | 1986 | 487 | | 1985 | 483 | | 1984 | 480 | | 1983 | 478 | | 1982 | 478 | | 1981 | 483 | | 1980 | 492 | | 1979 | 307 | | 1978 | 64 | | 1977 | 16 | | 1976 | 25 | | 1975 | 38 | | 1974 | 55 | | 1973 | 78 | | 1972 | 102 | | 1971 | 126 | | 1970 | 149 | | 1969 | 167 | | 1968 | 178 | | 1967 | 185 | | 1966 | 187 | | 1965 | 189 | | 1964 | 191 | | 1963 | 192 | | 1962 | 193 | | 1961 | 196 | | 1960 | 198 |
|