Year	current US$
1995	3955000000.000001
1996	4221000000.000001
1997	4417000000.000001
1998	4509000000.000001
1999	4859000000.000001
2000	5124000000.000001
2001	4771000000.000001
2002	4840000000.000001
2003	5276000000.000001
2004	5718000000.000001
2005	6304000000.000001
2006	6793000000.000001
2007	7235000000
2008	7181000000
2009	6695000000
2010	7030000000
2011	7044000000.000001
2012	7198000000.000002
2013	7318000000.000003
2014	9067000000.000004
2015	9609000000.000004
2016	10387000000.000006
2017	10727000000.000006
2018	11581000000.000006