Year	constant 2015 US$
1970	1916.2785438123992
1971	1904.0620785411058
1972	1893.6626723178474
1973	2492.5225456521976
1974	2802.8519836738856
1975	2714.018405330077
1976	2634.50498538036
1977	2610.047324454527
1978	2666.451936943961
1979	2634.378267121781
1980	2361.8263758920207
1981	2420.689796427519
1982	2438.5381386109075
1983	2706.6222281066307
1984	2701.474809783635
1985	2433.314319256261
1986	2913.483576735607
1987	3065.6421273722267
1988	3186.0519132075665
1989	3041.5781030376534
1990	3051.1552237501455
1991	2988.543472700401
1992	3137.798747446172
1993	3263.1271156328244
1994	3392.8138097959063
1995	3609.054378630211
1996	3184.704423601167
1997	2932.767060411455
1998	2868.8337363218147
1999	2795.3152600398253
2000	2843.3258043133287
2001	3029.808913892653
2002	3135.184155305691
2003	3086.3918727054106
2004	3068.2911806727643
2005	3128.6833167244968
2006	3143.0161125966824
2007	3260.615840954087
2008	3023.7223110706477
2009	3148.5931690880893
2010	3331.091119372884
2011	3351.881033667006
2012	3356.676079944964
2013	3535.5020152536413
2014	3559.243062181876
2015	3708.2155617932203
2016	3872.4526457409834
2017	4114.260986685125
2018	4460.336250159691
2019	5061.103712998569
2020	5066.0058386798655
2021	5288.3900246637095
2022	5313.444826979118
2023	5429.088484617581