Year	current US$
1995	5000000
1996	4000000
1997	7000000
1998	8000000
1999	14000000
2000	15000000
2001	24000000
2002	36000000
2003	48000000
2004	76000000
2005	73000000
2006	167000000
2007	346000000
2008	514000000
2009	253000000
2010	160000000
2011	356000000
2012	434000000
2013	530000000
2014	423000000
2015	426000000
2016	432000000
2017	429000000
2018	459000000
2019	644000000
2020	151000000