Year	constant 2010 US$
1977	4253214.2297906
1978	5871085.93304283
1979	4867363.93781143
1980	6223992.69438666
1981	7328545.05111719
1982	8446847.22809618
1983	8611842.42522772
1984	8061857.88357052
1985	9115994.89418588
1986	9505567.51212768
1987	10069301.8740333
1988	11091356.6321981
1989	11760504.2982878
1990	12113411.0596316
1991	12599239.3646684
1992	13566297.4876893
1993	13767944.3199758
1994	12443398.8080448
1995	12727563.0827711
1996	13492941.3003821
1997	13832106.1790271
1998	16160387.9076324
1999	13364617.5822795
2000	14354595.3796934
2001	13518440.6783866
2002	11992975.94288
2003	13130228.3580029
2004	14052174.7409485
2005	13692107.648427
2006	14426198.6914698
2007	13845732.3057947
2008	12152851.4205367
2009	11834390.3170289
2010	11661224.0740741
2011	10977017.88425
2012	11593674.6342305
2013	11971300.1486513
2014	11157606.3975184
2015	10096815.7359732
2016	7983298.30178684
2017	6753827.76645188
2018	5065370.7421561