Year	current US$
1995	10000000
1996	11000000
1997	15000000
1998	20000000
1999	29000000
2000	41000000
2001	54000000
2002	65000000
2003	87000000
2004	99000000
2005	122000000
2006	209000000
2007	304000000
2008	352000000
2009	286000000
2010	278000000
2011	368000000
2012	394000000
2013	422000000
2014	405000000
2015	347000000
2016	365000000
2017	426000000
2018	488000000
2019	502000000
2020	159000000