Year	current US$
2005	477000000
2006	393000000
2007	334000000
2008	473000000
2009	361000000
2010	324000000
2011	300000000
2012	295000000
2013	326000000
2014	316000000
2015	347000000
2016	246000000
2017	171000000
2018	196500000
2019	140000000
2020	50000000