Year	current US$
2006	394000000
2007	453000000
2008	459000000
2009	407000000
2010	417000000
2011	326000000
2012	327000000
2013	322000000
2014	378000000
2015	363000000
2016	373000000
2017	369000000
2018	334000000
2019	342000000
2020	212000000