Year	constant 2015 US$
1960	2348.4299167086674
1961	2522.3087355445564
1962	2646.980647750306
1963	2753.708495775006
1964	2901.087083544946
1965	3296.423026514106
1966	3569.706302847142
1967	3859.757335172568
1968	4293.816556113051
1969	4822.203380126379
1970	5197.6055126909005
1971	5743.415583536557
1972	6393.164645745563
1973	6675.966120305009
1974	6860.91829605536
1975	6638.431519978045
1976	7622.344733914131
1977	7190.9122938338905
1978	6073.006984510442
1979	5169.023978111613
1980	3914.121005752007
1981	3512.8064445828372
1982	4120.734158709995
1983	4418.726750772516
1984	3959.315272752938
1985	3893.510146026589
1986	3394.2547530721927
1987	3279.251306801566
1988	2986.998135279187
1989	3079.5786633124867
1990	3363.510120199926
1991	3647.571113727961
1992	3680.2178761607647
1993	3602.8151045778573
1994	3528.0306917936737
1995	3564.661773499481
1996	3741.5813575967372
1997	3738.567341255428
1998	3757.343085687278
1999	3772.3559371836386
2000	3927.709223318438
2001	3953.479697991707
2002	4231.478907999563
2003	4554.593872947717
2004	4675.940805273774
2005	4748.030253989406
2006	4908.959951801282
2007	5232.7035488071415
2008	5174.354771360069
2009	5155.857249620236
2010	5378.717710864504
2011	5450.938212733976
2012	5180.08602726727
2013	5027.484717285315
2014	5178.900706551866
2015	4990.936795416546
2016	5332.101031813503
2017	5401.455936755028
2018	5233.28205397474
2019	5017.117215175343
2020	5141.084776493006
2021	5344.958024744882
2022	5507.533395007688
2023	5739.943951213204