Year	constant 2015 US$
1991	249650000
1992	334240000
1993	250230000
1994	150310000
1995	245060000
1996	97320000
1997	76070000
1998	54050000
1999	55120000
2000	51680000
2001	59150000
2002	56160000
2003	56630000
2004	55860000
2005	62490000
2006	77970000
2007	80480000
2008	96170000
2009	91390000
2010	128540000
2011	102500000
2012	92920000
2013	93930000
2014	103780000
2015	103870000
2016	-22310000
2017	-251530000