Year	current US$
1995	50000000
1996	54000000
1997	80000000
1998	100000000
1999	125000000
2000	129000000
2001	135000000
2002	135000000
2003	160000000
2004	192000000
2005	206000000
2006	249000000
2007	277000000
2008	303000000
2009	336000000
2010	314000000
2011	391000000
2012	421000000
2013	417000000
2014	446000000
2015	528000000
2016	642000000
2017	841000000
2018	544000000
2019	515000000
2020	199000000