Year	current US$
2000	145000000
2001	250000000
2002	244000000
2003	383000000
2004	426000000
2005	362000000
2006	474000000
2007	541000000
2008	485000000
2009	507000000
2010	471000000
2011	516000000
2012	416000000
2013	357000000
2014	552000000
2015	540000000
2016	295000000
2017	449000000
2018	488000000
2019	451000000
2020	155000000