Year	constant 2010 US$
1991	1463.43029466164
1992	1387.69744355268
1993	1756.16400755536
1994	1964.36986737252
1995	2414.71393813711
1996	2445.1650143342
1997	2560.25691037616
1998	2661.74182083461
1999	3803.49343214147
2000	4179.8937231547
2001	3773.38678933107
2002	3620.61788796142
2003	3583.2487000462
2004	3740.15490947202
2005	3579.81175462302
2006	3565.95389622325
2007	4672.89827615869
2008	4633.64752829111
2009	4983.28825184446
2010	4671.77801042512
2011	4846.40362435503
2012	5174.41665602096
2013	5038.23226719622
2014	4937.65346596366
2015	5264.26935148568
2016	5049.88021703051
2017	3955.88708224487
2018	3202.7497080268