Year	constant 2010 US$
1989	3859.56334049628
1990	3931.97295567106
1991	3757.13458803151
1992	4468.76533782509
1993	5093.197833859
1994	4570.75172187483
1995	4241.35161305419
1996	4607.28310708396
1997	5080.85048156735
1998	4479.57178007091
1999	4257.67721106537
2000	3877.44149629446
2001	3959.18345135654
2002	3909.64665459938
2003	4444.31204250705
2004	4904.04604176975
2005	4800.45174351149
2006	4910.25873153102
2007	4945.77939118835
2008	4973.57665480507
2009	5160.67648886311
2010	5189.47410626127
2011	5400.58611877458
2012	5790.21231939304
2013	6057.0007273669
2014	5791.80952455255
2015	5978.16226641267
2016	5833.92758840756
2017	6004.66228720045
2018	6123.18768984506