Year	current US$
1995	234000000
1996	135000000
1997	178000000
1998	151000000
1999	211000000
2000	290000000
2001	165000000
2002	113000000
2003	165000000
2004	161000000
2005	141000000
2006	142000000
2007	156000000
2008	184000000
2009	249000000
2010	261000000
2011	332000000
2012	304000000
2013	350000000
2014	400000000
2015	427000000
2016	484000000
2017	603000000
2018	755000000
2019	920000000
2020	394000000