Year	current US$
1995	4013000000
1996	4449000000
1997	4973000000
1998	5282000000
1999	5228000000
2000	5460000000
2001	4888000000
2002	2744000000
2003	2997000000
2004	3208000000
2005	3554000000
2006	4047000000
2007	5077000000
2008	5987000000
2009	5808000000
2010	6448000000
2011	7602000000
2012	8466000000
2013	8421000000
2014	7837000000
2015	9348000000
2016	12273000000
2017	14180000000
2018	13084000000
2019	9845000000
2020	2746000000