Year US Dollars 1970 20787000 1971 23601000 1972 20019000 1973 31067000 1974 47356000 1975 62533000 1976 85306000 1977 164289000 1978 262706000 1979 295034000 1980 330414000 1981 328159000 1982 351832000 1983 397716000 1984 409964000 1985 511098000 1986 639698000 1987 827504000 1988 845242000 1989 717255000 1990 833673000 1991 967441000 1992 1039802000 1993 1118916000 1994 1135034000 1995 1274253000 1996 1301459000 1997 1304481000 1998 1462915000 1999 1599935000 2000 1437931000 2001 1507802000 2002 1554668000 2003 1745967000 2004 1931701000 2005 2000596000 2006 1131708000 2007 1465190000 2008 1583206000 2009 1916662000 2010 2148426000 2011 2290315000 2012 2519207000 2013 2564597000 2014 2542893000 2015 2622005000 2016 2824879000