Year	current US$
1995	82000000
1996	88000000
1997	87000000
1998	67000000
1999	82000000
2000	96000000
2001	84000000
2002	79000000
2003	88000000
2004	118000000
2005	132000000
2006	113000000
2007	106000000
2008	108000000
2009	108000000
2010	102000000
2011	116000000
2012	110000000
2013	105000000
2014	99000000
2015	115000000
2016	119000000
2017	138000000
2018	160000000
2019	174000000
2020	77000000