Year	current US$
1995	14000000
1996	23000000
1997	8000000
1998	14000000
1999	17000000
2000	31000000
2001	32000000
2002	34000000
2003	37000000
2004	50000000
2005	68000000
2006	89000000
2007	118000000
2008	144000000
2009	113000000
2010	126000000
2011	141000000
2012	159000000
2013	180000000
2014	149000000
2015	96000000
2016	91000000
2017	99000000
2018	101000000
2019	102000000
2020	32000000