Year US Dollars 1970 5893188000 1971 6353923000 1972 6893777000 1973 7374659000 1974 7798535000 1975 7901570000 1976 9501618000 1977 11675730000 1978 13507656000 1979 21176832000 1980 27322462000 1981 35809459000 1982 43787000000 1983 46108325000 1984 49060797000 1985 51156729000 1986 52688153000 1987 58722661000 1988 59015257000 1989 65538427000 1990 62477598000 1991 65672389000 1992 68605634000 1993 64681396000 1994 75094059000 1995 98773126000 1996 111145506000 1997 128251440000 1998 141504496000 1999 151913802000 2000 150062927000 2001 152649934000 2002 148320196000 2003 163442689000 2004 167999631000 2005 130788489000 2006 118921237000 2007 120818040000 2008 129752181000 2009 133695117000 2010 126641210000 2011 139509123000 2012 136543043000 2013 146568611000 2014 145471849000 2015 173456948000 2016 190489683000