Year	US Dollars
1990	169701776245.98801
1991	175077958386.255
1992	177673125076.36102
1993	175802938364.15002
1994	185113457193.64697
1995	199725003108.81894
1996	216774595604.04697
1997	226986914547.72198
1998	229173121300.85504
1999	245880783278.06299
2000	239603048216.15594
2001	267601137445.784
2002	278771965628.45093
2003	310246791962.453
2004	426799225700.47101
2005	452182024626.05597
2006	554245312740.8739
2007	583199170246.44617
2008	630799513624.24792
2009	670068834843.55408
2010	757872423681.82507
2011	809485215579.66077
2012	866143160345.68091
2013	926005324016.09473
2014	1019169489292.16003
2015	1065274537748.33997
2016	1066667677460.35022
2017	1084539443931.02002