Year	constant 2015 US$
1967	642.0883393086707
1968	647.3968355773491
1969	666.4785404640535
1970	667.6478507278448
1971	681.2971326569639
1972	676.1199853799881
1973	668.9290960597314
1974	689.7850728840247
1975	689.3122943794904
1976	692.8867142564801
1977	695.0060030823402
1978	676.3362124713708
1979	660.6890831182453
1980	664.9695722642027
1981	671.0873494593201
1982	663.5147410453715
1983	656.2409068492649
1984	633.8271949608117
1985	621.7259723452441
1986	622.1533104597894
1987	637.2664287359532
1988	643.2673527501021
1989	626.0722810434228
1990	593.6182800557414
1991	586.0437947486573
1992	569.1870257296903
1993	557.7167945470252
1994	550.5024240010903
1995	562.251006552473
1996	577.5843106737334
1997	596.456518482647
1998	604.0363683732646
1999	603.3353858281613
2000	606.3618059109798
2001	615.9611036413165
2002	626.8648348781272
2003	637.7932723275526
2004	657.8038502798796
2005	681.2032564680416
2006	700.2601820805854
2007	721.391894994531
2008	739.8708203674101
2009	748.9333178883572
2010	778.8222979530183
2011	763.1223125624468
2012	718.7530567681067
2013	723.8647251125338
2014	737.1908955017173
2015	714.7715646924776
2016	710.3081510386389
2017	712.5045501466923
2018	717.0834964971293
2019	726.8310503955445
2020	709.3275018059663
2021	704.7831999425998
2022	711.9233790697774
2023	713.7898986586932