Year	constant 2015 US$
1960	3874.3438394238788
1961	3920.478872781274
1962	3927.5339288282894
1963	3994.4942544651626
1964	4103.926517268884
1965	4442.057779873307
1966	5118.4096043732125
1967	5546.078510991726
1968	5768.676797313171
1969	5829.0293292106135
1970	5792.600557909042
1971	5832.62598472724
1972	5717.37354526569
1973	5631.431797895223
1974	5679.925782735834
1975	5874.431950610066
1976	6439.100042203958
1977	7158.807905663241
1978	7709.723337544745
1979	7755.3180517840565
1980	7115.274492840947
1981	7605.313720246131
1982	7258.294814502185
1983	6936.227923295265
1984	6747.3886979342315
1985	6801.384746980729
1986	6764.920344365758
1987	6273.624854650963
1988	6674.305799323811
1989	6848.679115384417
1990	6470.829997342338
1991	6594.021070031876
1992	6564.532952777114
1993	6083.324529394509
1994	6228.619692289739
1995	6114.76736520243
1996	6045.894090402432
1997	6262.766599491368
1998	6283.849260188586
1999	6081.178857273544
2000	6098.1860770498815
2001	6244.848607241533
2002	6312.568164473972
2003	6602.182887410651
2004	7068.0761092319135
2005	7305.327267131137
2006	7642.651014930123
2007	7943.178946041591
2008	8179.463155478052
2009	8331.578840819564
2010	8664.457270356737
2011	9070.51556472402
2012	9214.991817479038
2013	9387.14960649868
2014	9316.391984988319
2015	8907.837258300911
2016	8383.230039488666
2017	8426.030498352435
2018	8751.283976767441
2019	8756.330288706169
2020	7275.511596205341
2021	7029.771617911383
2022	7141.960436057145
2023	7229.409646859943