Year	current US$
1995	73000000
1996	77000000
1997	75000000
1998	73000000
1999	69000000
2000	86000000
2001	90000000
2002	109000000
2003	118000000
2004	135000000
2005	170000000
2006	224000000
2007	290000000
2008	359000000
2009	307000000
2010	298000000
2011	349000000
2012	396000000
2013	428000000
2014	442000000
2015	370000000
2016	334000000
2017	380000000
2018	438000000
2019	479000000
2020	303000000