Year	US Dollars
1990	111338680.09994
1991	151876416.74909
1992	158472741.90313
1993	156543910.71658
1994	161459065.53113
1995	173864288.01588
1996	154868027.85619
1997	190231491.05126
1998	216608019.75502
1999	200191441.85613
2000	218254839.95058
2001	234026129.69455
2002	228457583.17849
2003	224018408.2226
2004	226823237.6702
2005	233433306.34121
2006	241792976.70187
2007	239555643.27311
2008	248504966.24524
2009	241672726.20975
2010	253079604.92502
2011	245348537.88805
2012	277445799.19196
2013	323413193.38611
2014	398053568.39077
2015	488282467.38072
2016	430340546.27854
2017	448031753.58422