Year	constant 2015 US$
1960	2066.9496284574698
1961	2140.462834822235
1962	2182.581494880159
1963	2229.9210791587225
1964	2173.9139080670857
1965	2130.782321646358
1966	2328.0977893527156
1967	2364.4447577381793
1968	2412.0362559636283
1969	2495.671852537418
1970	2439.612643404958
1971	2715.3316852851744
1972	2878.336122145111
1973	2646.876872610263
1974	2129.1600890820714
1975	1856.4084818101037
1976	1832.6287572179187
1977	2094.043476404041
1978	2217.74497052874
1979	2326.8685670727427
1980	2452.0380806625753
1981	2740.2516728270784
1982	2302.453228564691
1983	2139.823357867907
1984	2122.908681573028
1985	2071.6128689238835
1986	2144.9145284789647
1987	2264.078819272317
1988	2384.6558223445227
1989	2584.537003124291
1990	2598.7762568431126
1991	2783.589238069843
1992	3116.8076684798093
1993	3296.6409437224
1994	3512.911606689448
1995	3802.60644772208
1996	4104.68403744603
1997	4354.822259737885
1998	4537.632402257399
1999	4438.00211104061
2000	4566.144722174476
2001	4606.890142783507
2002	4678.831117291637
2003	4813.222332118998
2004	5179.834010453901
2005	5528.340808604849
2006	5869.1595107943185
2007	6189.123001850055
2008	6323.239284087055
2009	6227.187868763127
2010	6866.703828044986
2011	7425.375462723975
2012	7821.429215531074
2013	8160.586761648515
2014	8270.11793344122
2015	8381.288625199293
2016	8555.732966932637
2017	8722.391534737464
2018	8891.151975358462
2019	8797.38323916388
2020	8035.208160208206
2021	9625.57686947797
2022	9728.489643709774
2023	9309.196101838517