Year current US$ 1970 81889.6573941536 1971 223107.461141447 1972 690779.791053823 1973 2310483.10997474 1974 1708629.19765221 1975 1809904.19704315 1976 1096244.1032904 1977 670263.992284886 1978 1060834.04575903 1979 2649989.31375567 1980 2384147.30337985 1981 1108960.47529654 1982 411859.50640153 1983 182873.631647264 1984 67359.1858769674 1985 182762.981637367 1986 236021.083849771 1987 640995.016284622 1988 6043906.40798803 1989 906117.758554158 1990 1903593.85168608 1991 4969851.26947109 1992 1019399.52041581 1993 579344.736257072 1994 2806585.03847742 1995 636514.349755904 1996 1913206.07893666 1997 6489449.96551634 1998 13999.6250090463 1999 9153.87880456439 2000 15061.2159418425 2001 13994.2099141173 2002 25249.4570368532 2003 9228.13323823718 2004 139244.549233096 2005 167594.037093634 2006 388689.814862766 2007 438991.465049864 2008 553545.245751502 2009 674791.86973107 2010 1363843.73505886 2011 2353681.56923515 2012 2216136.69689542 2013 1493470.22225599 2014 1219857.76770599 2015 920062.928839796 2016 1182753.5636495 2017 958571.368218243 2018 0 2019 0 2020 0 2021 0