Year	current US$
1995	113000000
1996	110000000
1997	125000000
1998	96000000
1999	142000000
2000	146000000
2001	80000000
2002	52000000
2003	49000000
2004	86000000
2005	135000000
2006	393000000
2007	473000000
2008	447000000
2009	270000000
2010	275000000
2011	323000000
2012	288000000
2013	316000000
2014	505000000
2015	389000000
2016	823000000
2017	1216000000
2018	762000000
2019	717000000
2020	691000000