Year	current US$
1999	102000000
2000	113000000
2001	128000000
2002	141000000
2003	203000000
2004	218000000
2005	255000000
2006	306000000
2007	368000000
2008	401000000
2009	308000000
2010	230000000
2011	250000000
2012	229000000
2013	203000000
2014	216000000
2015	185000000
2016	187000000
2017	214000000
2018	221000000
2019	221000000
2020	63000000