Year	current US$
1970	3958.595724900932
1971	4193.162374346455
1972	4967.343963105935
1973	6183.808440841387
1974	7174.444564017103
1975	7963.551816401275
1976	7758.716830452353
1977	8206.982365406573
1978	9456.015876593261
1979	12054.031642983104
1980	12534.82847429167
1981	10516.75632519227
1982	9739.228550210006
1983	8108.677347543342
1984	7825.16015829635
1985	7914.873991078364
1986	10568.929127706853
1987	12832.999360564827
1988	14529.059877382482
1989	15404.821589204093
1990	19208.678378686753
1991	19967.733909504703
1992	21123.05606018239
1993	17024.313169747045
1994	16670.938428179557
1995	18731.650185415125
1996	19081.549241787663
1997	18253.07770112711
1998	18592.243642149213
1999	18891.098973107684
2000	21674.29972151901
2001	22829.0446484521
2002	24901.972142126524
2003	32025.948948598147
2004	37698.32613432743
2005	39599.68044392482
2006	43122.59865184278
2007	50629.738092564614
2008	53938.85213363264
2009	49950.933498820574
2010	48237.89117382354
2011	51428.1969515188
2012	44902.38076636453
2013	44747.75386416952
2014	45680.534992016466
2015	38885.53032229833
2016	39931.21698002158
2017	40632.23155219953
2018	42904.82845592234
2019	41328.60049783729
2020	37207.22199949942
2021	42066.49051788219
2022	42350.69706908742
2023	46544.72071994825