Year	current US$
1995	27000000
1996	32000000
1997	32000000
1998	24000000
1999	23000000
2000	18000000
2001	16000000
2002	14000000
2003	21000000
2004	26000000
2005	27000000
2006	29000000
2007	31000000
2008	30000000
2009	30000000
2010	23000000
2011	24000000
2012	22000000
2013	17000000
2014	16000000
2015	34000000
2016	48000000
2017	23000000
2018	24000000
2019	21000000
2020	5000000