Year | Value | 2020 | 16,512.389169045 | 2019 | 18,613.738349545 | 2018 | 19,156.953809861 | 2017 | 16,633.87800211 | 2016 | 16,043.714200469 | 2015 | 16,175.073074752 | 2014 | 18,648.263504138 | 2013 | 18,517.148067455 | 2012 | 18,596.862216365 | 2011 | 17,380.872046493 | 2010 | 14,642.577300016 | 2009 | 12,407.276251262 | 2008 | 14,403.831416614 | 2007 | 12,305.984758038 | 2006 | 11,386.352316882 | 2005 | 10,265.56112217 | 2004 | 8,354.6224266488 | 2003 | 7,371.5427316737 | 2002 | 6,913.3707106458 | 2001 | 6,731.2347771213 | 2000 | 6,907.0586225007 | 1999 | 6,360.7898851946 | 1998 | 5,865.0931767954 | 1997 | 6,653.0416820174 | 1996 | 6,400.2303102609 | 1995 | 6,192.265304048 | 1994 | 5,991.8887980764 | 1993 | 6,195.5232768135 | 1992 | 6,602.0684736317 | 1991 | 6,490.8858361332 | 1990 | 5,959.8891518325 | 1989 | 5,617.6886338174 | 1988 | 5,580.2293539958 | 1987 | 5,514.3204561682 | 1986 | 5,926.1977558546 | 1985 | 7,281.8327857935 | 1984 | 8,197.4744495648 | 1983 | 9,439.3420133352 | 1982 | 11,111.864000437 | 1981 | 11,550.567096824 | 1980 | 9,693.9297304271 | 1979 | 6,069.3443800463 | 1978 | 6,631.8864964343 | 1977 | 6,296.3033252081 | 1976 | 5,868.3472208731 | 1975 | 4,358.5688466859 | 1974 | 3,611.4336426637 | 1973 | 1,172.8291974816 | 1972 | 892.89919942809 | 1971 | 771.96569072854 | 1970 | 633.98922770622 |
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