Year	US Dollars
1990	8243622077.32556
1991	7799721806.9342
1992	3883786430.49208
1993	3983285124.42318
1994	4669797052.24733
1995	5091768590.1826
1996	5649575324.42393
1997	6122803147.4995
1998	6464125812.4275
1999	6765668294.54572
2000	7312962664.13328
2001	8216359860.09029
2002	9503884952.94383
2003	11017601206.143
2004	12461664771.2174
2005	14816824931.3305
2006	17375047780.65359
2007	20420228115.3273
2008	22368198058.2348
2009	19024006136.84749
2010	19831190099.8922
2011	20909528812.773
2012	22923478928.5206
2013	24560784435.8414
2014	25540611009.0006
2015	26526222994.0203
2016	26383467429.6048
2017	29491077420.92519