Year	US Dollars
1990	11895661347.2122
1991	11240659753.0206
1992	11864783374.4307
1993	12463307828.4049
1994	12592062038.8804
1995	13064558280.4162
1996	13739861785.5456
1997	14698019248.659
1998	15537277041.7101
1999	16652536028.3376
2000	17718226532.8979
2001	19311626266.4848
2002	17069470701.1246
2003	19145330977.1813
2004	20630301895.2336
2005	22328594753.84769
2006	24201351157.7669
2007	26579286515.8165
2008	29101158850.3512
2009	27992895120.8299
2010	28410602706.47129
2011	29269019629.4989
2012	30211820008.2679
2013	31392704032.9461
2014	33140077421.4231
2015	34167855776.7731
2016	35969315248.20639
2017	38540656390.0468