Year	constant 2010 US$
1991	3732.3210973971
1992	3554.70172305658
1993	3375.96065862833
1994	3647.85957203788
1995	3427.52461787977
1996	3447.11093169877
1997	4199.53325399269
1998	4304.2725999193
1999	4543.71057219892
2000	4643.67980567454
2001	4738.61539258467
2002	5088.55318173336
2003	5364.04469273273
2004	5494.45360053539
2005	5573.15766112039
2006	5929.23150961693
2007	6308.69618886081
2008	5780.02261834415
2009	5573.80354853046
2010	5863.2520373614
2011	6093.52622854581
2012	6225.27608358674
2013	6211.45561504964
2014	6456.96318191303
2015	6355.83749546721
2016	5867.48928859234
2017	5864.39995723429
2018	5969.382878209