| Year | Value | | 2021 | 5,056.7981830142 | | 2020 | 5,207.104702037 | | 2019 | 5,964.3727665149 | | 2018 | 5,704.0802911502 | | 2017 | 5,556.1269819461 | | 2016 | 5,217.9687024883 | | 2015 | 5,349.6204392119 | | 2014 | 5,662.3228444046 | | 2013 | 5,668.5531251988 | | 2012 | 5,373.1738930316 | | 2011 | 4,732.8048766068 | | 2010 | 4,146.1089611066 | | 2009 | 3,474.0273518535 | | 2008 | 3,422.2650135016 | | 2007 | 2,834.8643081137 | | 2006 | 2,450.8805665011 | | 2005 | 2,254.7909780006 | | 2004 | 2,029.506307307 | | 2003 | 1,871.7582302369 | | 2002 | 1,783.5505128283 | | 2001 | 1,712.3656903114 | | 2000 | 1,696.0413633626 | | 1999 | 1,689.2242938264 | | 1998 | 1,926.1548288483 | | 1997 | 2,034.3581126006 | | 1996 | 1,956.6768627389 | | 1995 | 1,894.5735939699 | | 1994 | 1,642.5948146633 | | 1993 | 1,310.4947025608 | | 1992 | 1,378.3018281431 | | 1991 | 1,332.125215805 | | 1990 | 961.18498052227 | | 1989 | 797.82214032822 | | 1988 | 538.23333254104 | | 1987 | 833.90660757873 | | 1986 | 621.70695485109 | | 1985 | 666.91372684291 | | 1984 | 717.28540157658 | | 1983 | 730.3931056965 | | 1982 | 992.15343476107 | | 1981 | 994.27856694936 | | 1980 | 789.43782511676 | | 1979 | 718.13106623353 | | 1978 | 618.66195951185 | | 1977 | 773.4827032047 | | 1976 | 859.29579449559 | | 1975 | 950.76538802065 | | 1974 | 778.30691211837 | | 1973 | 640.57082403213 | | 1972 | 564.68397108025 | | 1971 | 523.69635834668 | | 1970 | 477.40986898964 |
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