Year	current US$
1998	4099999.9999999995
1999	9200000
2000	9900000
2001	6200000
2002	6900000
2003	7400000
2004	7700000
2005	7300000
2006	6700000
2007	5000000
2008	7700000
2009	8300000.000000001
2010	11100000
2011	15900000
2012	15000000
2013	30900000
2014	56100000
2015	62500000
2016	69100000
2017	65900000.00000001
2018	71900000