Year	US Dollars
1992	37808475385.4109
1993	37885633312.1158
1994	36693762581.0382
1995	37151138566.48161
1996	38369193864.1332
1997	40781380657.43669
1998	43219835492.5153
1999	45625349285.1057
2000	48139439612.74871
2001	51196762145.30321
2002	54227890708.0636
2003	57837796468.93461
2004	64481437277.2507
2005	71385556336.922
2006	78678148386.36079
2007	92967783989.76807
2008	104964004432.00301
2009	110908562689.71703
2010	122251186900.03697
2011	136295408676.256
2012	150886306570.36902
2013	167457416596.67996
2014	182092766315.733
2015	194128698214.97998
2016	211402269413.54898
2017	230950018368.45703