Year	current US$
1995	57000000
1996	33000000
1997	50000000
1998	40000000
1999	34000000
2000	39000000
2001	39000000
2002	50000000
2003	54000000
2004	91000000
2005	103000000
2006	117000000
2007	171000000
2008	216000000
2009	173000000
2010	163000000
2011	186000000
2012	198000000
2013	230000000
2014	234000000
2015	219000000
2016	256000000
2017	323000000
2018	381000000
2019	396000000
2020	316000000