Year	current US$
1995	172000000
1996	186000000
1997	210000000
1999	23000000
2000	6000000
2001	12000000
2002	17000000
2003	8000000
2004	8000000
2005	6000000
2006	7000000
2007	7000000
2008	16000000
2009	739000000
2010	547000000
2011	648000000
2012	641000000
2013	1333000000
2014	1248000000
2015	1276000000
2016	1192000000
2017	1150000000
2018	1328000000
2019	1141000000
2020	602000000