Year	constant 2010 US$
1975	3615.83349304036
1976	4248.05522296988
1977	5022.73330306926
1978	5558.57704898659
1979	5842.44978589262
1980	6107.06351148392
1981	6109.09909904321
1982	6730.94604202202
1983	7160.87845846824
1984	7387.17441185512
1985	7729.41493715254
1986	7773.77396762562
1987	8108.46559254573
1988	8865.87694629601
1989	9343.76304815847
1990	9965.63304342783
1991	10673.9681032414
1992	10723.9256357979
1993	9982.47352994662
1994	10446.2522146305
1995	13240.2101953499
1996	13514.5109933306
1997	13655.7933483855
1998	14461.9067174296
1999	14898.3090536017
2000	15923.2465462215
2001	16625.806933475
2002	16943.1640199029
2003	17468.2453517887
2004	18475.964243978
2005	18923.8585453275
2006	19339.5314805325
2007	20777.6563176132
2008	21926.7267294774
2009	19952.9420095524
2010	20029.933647725
2011	19433.9593374008
2012	18909.1936538302
2013	17869.766893739
2014	18253.9315579448
2015	18802.7612840224
2016	19554.0700474876
2017	20163.7495248093
2018	20686.3761840806