Year	constant 2015 US$
1970	3135.2854716089932
1971	3211.6945813056946
1972	3402.0135378230016
1973	3545.9967869079064
1974	3904.52309573476
1975	4634.093261267225
1976	5395.157462897563
1977	6028.931135204012
1978	6632.430817284075
1979	7254.3202144295365
1980	7684.722658595683
1981	7881.056214474202
1982	7890.027751810286
1983	7731.95775832879
1984	7803.192491013711
1985	7865.528452064935
1986	8035.722418388063
1987	8308.620743038975
1988	8934.07352030925
1989	9571.190136273564
1990	10074.309100155968
1991	10419.96130506102
1992	10796.794050700617
1993	11168.46680255657
1994	11689.765539404256
1995	12344.826345576965
1996	12727.299154313598
1997	13295.370652500646
1998	13886.292355603415
1999	14455.764756842542
2000	17189.56549407772
2001	16860.522964945005
2002	17164.598393394746
2003	17746.784675830175
2004	17652.718116760745
2005	18134.0520355123
2006	18521.638379980977
2007	19338.43061911483
2008	19948.17139248582
2009	19573.857994630464
2010	20557.73774889717
2011	20566.427774748157
2012	21221.6057063718
2013	22071.065151099374
2014	23286.226451432623
2015	24921.714176998194
2016	25181.477100563956
2017	27164.300416560196
2018	28177.549539397456
2019	29021.335793920654
2020	26071.219900612523
2021	29152.5072116366
2022	30760.63550072041
2023	31189.63321093984