Year	constant 2015 US$
1975	4855.934714878252
1976	5637.629958485084
1977	6135.959208972
1978	6393.736131917484
1979	6941.18053822101
1980	6821.4991389995785
1981	6390.3224949891555
1982	6365.161929790907
1983	6385.441638182251
1984	6545.123930900162
1985	6513.474150565176
1986	6578.561901826299
1987	6904.37615752114
1988	7079.269821253888
1989	7146.663339171389
1990	7344.089498734181
1991	7270.021326618418
1992	7174.8473692518655
1993	7316.615210417483
1994	7438.561659719053
1995	7726.933409131116
1996	7925.7969934482535
1997	8190.813634358529
1998	8455.420802606903
1999	8554.584858033817
2000	9021.154420769755
2001	9187.209719955137
2002	9375.180336028192
2003	9669.142893287579
2004	9996.659561537605
2005	10321.982833760014
2006	10802.946394137904
2007	11299.020077076259
2008	11342.586755339651
2009	10764.9779338898
2010	10919.0733013204
2011	11146.059357442658
2012	11211.155775907935
2013	11262.27958151478
2014	11378.412944772874
2015	11597.285610462439
2016	11888.829025304769
2017	12287.065357805277
2018	12616.29647419957
2019	12993.128062226495
2020	12160.077682788133
2021	12876.635804246225
2022	13316.494392304376
2023	13507.378289703123