Year	constant 2015 US$
1960	8604.849005092728
1961	9024.449479488809
1962	9457.957789411108
1963	9827.279695911804
1964	10326.814235531614
1965	10777.102365279914
1966	11149.17934106647
1967	11457.456141939767
1968	12007.145862742937
1969	12761.032776889342
1970	13388.70149757726
1971	13803.310854149973
1972	14364.944022517891
1973	15131.675336985805
1974	15510.332750618034
1975	15329.606765674278
1976	15992.266700284801
1977	16380.540896938515
1978	16804.039042743447
1979	17373.903584403455
1980	17648.697697170206
1981	17669.03546891903
1982	17756.913133394508
1983	17965.309518749662
1984	18372.44813294866
1985	18754.503182899425
1986	19184.7530650857
1987	19614.915461582088
1988	20356.33622386098
1989	21075.86878805008
1990	21700.782386735616
1991	21933.87580943108
1992	22064.37284039124
1993	21851.763136867507
1994	22372.50524019478
1995	22928.37076385755
1996	23321.720060051088
1997	23904.512413062726
1998	24591.277915890976
1999	25274.69412422113
2000	26229.11932814467
2001	26764.452770460495
2002	26999.68995755559
2003	27148.099722667965
2004	27747.638954664693
2005	28181.693428346356
2006	29072.08544889625
2007	29889.150656824044
2008	29984.52596469553
2009	28612.79141089888
2010	29208.52055745581
2011	29816.626760491952
2012	29563.743611083537
2013	29467.46172003285
2014	29864.5423824829
2015	30487.652369273248
2016	31022.99302607783
2017	31855.489762201876
2018	32456.7454998497
2019	33015.651407637786
2020	31126.702555418484
2021	33034.96600395266
2022	34169.43212857995
2023	34162.571969493096