Year	current US$
1995	17000000
1996	16000000
1997	17000000
1998	16000000
1999	17000000
2000	195000000
2001	166000000
2002	164000000
2003	242000000
2004	278000000
2005	271000000
2006	263000000
2007	276000000
2008	248000000
2009	247000000
2010	278000000
2011	300000000
2012	252000000
2013	212000000
2014	177000000
2015	180000000
2016	262000000
2017	307000000
2018	347000000
2019	323000000
2020	277000000