Year	current US$
1998	4000000
1999	4000000
2000	5000000
2001	8000000
2002	12000000
2003	14000000
2004	16000000
2005	21000000
2006	22000000
2007	46000000
2008	55000000
2009	47000000
2010	52000000
2011	49000000
2012	52000000
2013	55000000
2014	45000000
2015	56000000
2016	45000000
2017	51000000
2018	59000000
2019	64000000
2020	44000000