Year	US Dollars
1989	-1990044085.13174
1990	-2325036799.02861
1991	-3160908123.44394
1992	-3576020994.2258
1993	-4606105644.66854
1994	-5234490180.88209
1995	-6037813759.15875
1996	-5805196028.44597
1997	-5201688860.01949
1998	-4689565288.5105
1999	-3945368353.75543
2000	-3755887230.5141
2001	-4297180762.8524
2002	-3609286898.83914
2003	-4140630182.42123
2004	-4626865671.64179
2005	-4413930348.25871
2006	-4641459369.81758
2007	-6103482587.06467
2008	-8479306266.60033
2009	-8339267061.09453
2010	-9390333242.38806
2011	-10917987147.6617
2012	-11667704724.2454
2013	-12283684564.2454
2014	-12582268197.0813
2015	-10031462715.3566
2016	-10725646774.3947
2017	-11802642389.9643