| Year | Value | | 2022 | 2,112 | | 2021 | 2,169 | | 2020 | 2,175 | | 2019 | 2,108 | | 2018 | 2,009 | | 2017 | 1,914 | | 2016 | 1,827 | | 2015 | 1,753 | | 2014 | 1,688 | | 2013 | 1,633 | | 2012 | 1,588 | | 2011 | 1,554 | | 2010 | 1,530 | | 2009 | 1,510 | | 2008 | 1,489 | | 2007 | 1,465 | | 2006 | 1,443 | | 2005 | 1,427 | | 2004 | 1,414 | | 2003 | 1,399 | | 2002 | 1,387 | | 2001 | 1,375 | | 2000 | 1,359 | | 1999 | 1,339 | | 1998 | 1,318 | | 1997 | 1,292 | | 1996 | 1,265 | | 1995 | 1,236 | | 1994 | 1,206 | | 1993 | 1,177 | | 1992 | 1,144 | | 1991 | 1,110 | | 1990 | 1,076 | | 1989 | 1,041 | | 1988 | 1,004 | | 1987 | 968 | | 1986 | 932 | | 1985 | 895 | | 1984 | 860 | | 1983 | 828 | | 1982 | 799 | | 1981 | 772 | | 1980 | 745 | | 1979 | 719 | | 1978 | 693 | | 1977 | 665 | | 1976 | 637 | | 1975 | 613 | | 1974 | 591 | | 1973 | 568 | | 1972 | 547 | | 1971 | 525 | | 1970 | 504 | | 1969 | 484 | | 1968 | 466 | | 1967 | 448 | | 1966 | 428 | | 1965 | 408 | | 1964 | 387 | | 1963 | 364 | | 1962 | 343 | | 1961 | 323 | | 1960 | 302 |
|