Year US Dollars 1970 716253000 1971 693955000 1972 809514000 1973 851175000 1974 946415000 1975 1080565000 1976 1360673000 1977 1803420000 1978 2238360000 1979 2633583000 1980 2784674000 1981 3310318000 1982 3422088000 1983 4164922000 1984 4412206000 1985 4898178000 1986 5670013000 1987 5934541000 1988 4997496000 1989 4229853000 1990 4369980000 1991 4158856000 1992 4333091000 1993 4402331000 1994 4971960000 1995 5370881000 1996 5290867000 1997 5326931000 1998 5702788000 1999 5668250000 2000 5899507000 2001 4800375000 2002 5115267000 2003 5875335000 2004 6296917000 2005 6978720000 2006 6268444000 2007 5113326000 2008 5720273000 2009 5810820000 2010 5806031000 2011 6210956000 2012 6663588000 2013 8201283000 2014 8917172000 2015 9913846000 2016 11015313000