Year	current US$
1995	106000000
1996	118000000
1997	120000000
1998	131000000
2009	167000000
2010	203000000
2011	317000000
2012	387000000
2013	441000000
2014	451000000
2015	557000000
2016	406000000
2017	337000000
2018	269000000
2019	257000000
2020	157000000