Year | Value | 2021 | 678.56349068879 | 2020 | 581.5205976 | 2019 | 2,043.245359 | 2018 | 1,085.47 | 2017 | 867.640758 | 2016 | 833.991 | 2015 | 826.83 | 2014 | 1,599.921996 | 2013 | 1,694.372004 | 2012 | 1,815.016 | 2011 | 1,501.275 | 2010 | 1,324.861 | 2009 | 1,838.162 | 2008 | 1,382.547 | 2007 | 1,229.704 | 2006 | 1,066.281 | 2005 | 1,021.453 | 2004 | 956.687 | 2003 | 852.449 | 2002 | 862.29 | 2001 | 799.565 | 2000 | 999.56 | 1999 | 1,000 | 1998 | 934 | 1997 | 926.4000244141 | 1996 | 862.799987793 | 1995 | 894.9000244141 | 1994 | 809.5 | 1993 | 718.299987793 | 1992 | 679.200012207 | 1991 | 486.6000061035 | 1990 | 609.5999755859 | 1989 | 604.700012207 | 1988 | 490 | 1987 | 453.200012207 | 1986 | 437.200012207 | 1985 | 455.1000061035 | 1984 | 458.799987793 | 1983 | 424.5 | 1982 | 353 | 1981 | 243.1000061035 | 1980 | 165.5 | 1979 | 155.3000030518 | 1978 | 136.5 | 1977 | 105.8000030518 | 1976 | 82.5999984741 | 1975 | 50.0999984741 | 1974 | 35.7999992371 | 1973 | 26.5 | 1972 | 15.1000003815 | 1971 | 11.6000003815 | 1970 | 4.5 |
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