Year	current US$
1995	8115000000
1996	8591000000
1997	7895000000
1998	8311000000
1999	9775000000
2000	9429000000
2001	9776000000
2002	10185000000
2003	12210000000
2004	13956000000
2005	14948000000
2006	15574000000
2007	17502000000
2008	19523000000
2009	19001000000
2010	18862000000
2011	20672000000
2012	20166000000
2013	22157000000
2014	23820000000
2015	13654000000
2016	14439000000
2017	15600000000
2018	18442000000
2019	18739000000
2020	13035000000