Year	current US$
1995	36000000
1996	104000000
1997	84000000
1998	85000000
1999	60000000
2000	57000000
2001	73000000
2002	62000000
2003	182000000
2004	158000000
2005	175000000
2006	181000000
2007	226000000
2008	156000000
2009	270000000
2010	159000000
2011	409000000
2012	349000000
2013	576000000
2014	595000000
2015	450000000
2016	505000000
2017	525000000
2018	581000000
2019	653000000
2020	437000000