Year	current US$
1995	114000000
1996	173000000
1997	103000000
2000	114000000
2001	89000000
2002	58000000
2003	74000000
2004	97000000
2005	105000000
2006	113000000
2007	119000000
2008	144000000
2009	139000000
2010	160000000
2011	198000000
2012	143000000
2013	93000000
2014	112000000
2015	100000000
2016	111000000
2017	101000000
2018	88000000
2019	86000000
2020	30000000