Year	constant 2011 international $
1990	2353.61067282651
1991	2327.22758700026
1992	2434.82909059375
1993	2492.14559553689
1994	2618.98153084019
1995	2789.9683577239
1996	2908.00235053499
1997	3007.37700400792
1998	3113.73847498456
1999	3283.76691116821
2000	3433.36262512061
2001	3637.3658515748
2002	3946.64827425735
2003	4169.12959304662
2004	4339.10149981028
2005	4577.05202489526
2006	4826.04646816956
2007	5627.24820980141
2008	5836.4363825016
2009	6163.40323693651
2010	6814.29428112798
2011	7269.3431327835
2012	7547.82563772115
2013	7615.58868611012
2014	7954.38085508368
2015	8380.1235184464
2016	8943.84913870065
2017	9246.67676323712
2018	9347.82645392757