Year	constant 2015 US$
1970	9886.43707698221
1971	10503.64876088718
1972	11077.71734197248
1973	11608.300236591163
1974	11935.30191768234
1975	12355.613313809796
1976	12939.944379098872
1977	13766.681222013263
1978	13542.84611908634
1979	14209.891074071653
1980	14567.952710193646
1981	14716.17476240357
1982	14988.42791223894
1983	15828.495027341332
1984	15492.70281378469
1985	15765.853043127107
1986	16101.356962252134
1987	16480.22440274082
1988	16853.17327389084
1989	17379.41887573626
1990	17977.893644462692
1991	18332.378766627826
1992	18762.583647227897
1993	18628.209025639877
1994	18935.768238511726
1995	19067.964900879117
1996	19601.876689842393
1997	19661.92794135003
1998	20210.971881364556
1999	20659.344798211812
2000	21252.013579436374
2001	21441.99989086018
2002	21482.27993808364
2003	21750.471777238017
2004	22117.62867702502
2005	22461.38211851472
2006	22818.17893432775
2007	22995.369135201065
2008	23140.42609577756
2009	23276.21783856524
2010	23451.231331975996
2011	23686.691045761607
2012	23702.004301718607
2013	23544.099830988598
2014	23431.751799269216
2015	23283.60832567591
2016	23389.120808163072
2017	23681.671570712177
2018	23827.48480480047
2019	23851.919519762083
2020	21727.184340284875
2021	22544.780984860536
2022	23594.854089725544
2023	23296.94200128097