Year	constant 2010 US$
1988	4310.66107063231
1989	2442.73604396303
1990	3006.4011220893
1991	4310.50974043075
1992	4767.12129466098
1993	5003.81188878993
1994	5159.4759643499
1995	5297.59525730321
1996	5761.1238546418
1997	5745.89960878822
1998	5899.92920538492
1999	5783.97202727955
2000	5716.6588512092
2001	5715.69480633084
2002	5641.09367183125
2003	5549.56082043425
2004	5665.17192603489
2005	5660.58978165366
2006	5683.13383505321
2007	6204.09687784295
2008	6781.60681081716
2009	7388.58736122261
2010	7756.74406876812
2011	7452.83480636987
2012	7190.73794578985
2013	6909.99395507347
2014	6649.21377221184
2015	6400.57906671425
2016	6330.42360672236
2017	6271.2193232913
2018	6249.76665455924