Year	US Dollars
1990	431407140.94521
1991	461292622.05715
1992	470514149.86504
1993	467398047.47749
1994	485548340.06012
1995	499893781.23361
1996	530127798.27484
1997	565515997.06345
1998	632824443.46183
1999	685131725.24152
2000	726941392.49707
2001	716978644.39986
2002	746091540.27103
2003	835410997.77585
2004	831021125.10939
2005	1045904614.61523
2006	1034273511.191
2007	1111741479.5308
2008	1147273912.33945
2009	1045345320.30047
2010	1087117005.54684
2011	1130918364.46605
2012	1136006202.20287
2013	1191051520.833
2014	1299844001.56102
2015	1402102725.38687
2016	1472707731.58804
2017	1553524563.31398