| Year | Value | | 2022 | 2,341 | | 2021 | 2,247 | | 2020 | 2,154 | | 2019 | 2,071 | | 2018 | 1,999 | | 2017 | 1,933 | | 2016 | 1,874 | | 2015 | 1,819 | | 2014 | 1,763 | | 2013 | 1,707 | | 2012 | 1,652 | | 2011 | 1,597 | | 2010 | 1,543 | | 2009 | 1,491 | | 2008 | 1,445 | | 2007 | 1,401 | | 2006 | 1,357 | | 2005 | 1,316 | | 2004 | 1,275 | | 2003 | 1,236 | | 2002 | 1,199 | | 2001 | 1,166 | | 2000 | 1,134 | | 1999 | 1,096 | | 1998 | 1,051 | | 1997 | 1,007 | | 1996 | 962 | | 1995 | 917 | | 1994 | 873 | | 1993 | 829 | | 1992 | 789 | | 1991 | 750 | | 1990 | 712 | | 1989 | 677 | | 1988 | 646 | | 1987 | 619 | | 1986 | 597 | | 1985 | 577 | | 1984 | 558 | | 1983 | 542 | | 1982 | 526 | | 1981 | 513 | | 1980 | 500 | | 1979 | 489 | | 1978 | 478 | | 1977 | 470 | | 1976 | 465 | | 1975 | 456 | | 1974 | 441 | | 1973 | 421 | | 1972 | 398 | | 1971 | 376 | | 1970 | 357 | | 1969 | 344 | | 1968 | 333 | | 1967 | 324 | | 1966 | 314 | | 1965 | 305 | | 1964 | 296 | | 1963 | 288 | | 1962 | 282 | | 1961 | 274 | | 1960 | 266 |
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