Year	current US$
1995	11599000000
1996	10011000000
1997	10113000000
1998	8677000000
1999	7097000000
2000	8848000000
2001	9285000000
2002	10918000000
2003	12880000000
2004	15285000000
2005	16972000000
2006	17484000000
2007	20424000000
2008	23169000000
2009	21019000000
2010	26693000000
2011	32902000000
2012	42798000000
2013	53453000000
2014	50428000000
2015	34932000000
2016	23952000000
2017	31058000000
2018	34271000000
2019	36152000000
2020	9140000000