Year	constant 2015 US$
1970	523.5343747668345
1971	500.65763656308184
1972	531.2789579455023
1973	530.716507972632
1974	536.7834530862526
1975	547.25178698705
1976	540.4036932929904
1977	471.0350851107234
1978	500.83767193643354
1979	493.87009042477837
1980	410.16038319512757
1981	476.9355097261703
1982	489.0533854877613
1983	464.98022550989026
1984	499.4269459619056
1985	512.2142865535752
1986	500.3467743588117
1987	506.9344037670165
1988	522.0039507259157
1989	545.0845421582641
1990	569.2386570239771
1991	586.0468618830308
1992	575.6679980578984
1993	568.9261932822469
1994	569.4276259237329
1995	579.7936081378044
1996	633.7853651972729
1997	662.3004316426923
1998	504.2601989403945
1999	578.1135660456747
2000	572.899840165086
2001	587.651805637484
2002	595.7172948700797
2003	580.4803185738239
2004	573.6120049989653
2005	596.7511327550467
2006	597.7690534374183
2007	597.6525450904294
2008	608.8043792810706
2009	607.8759671412603
2010	625.5553753761526
2011	658.5680953563012
2012	630.1725494843836
2013	633.4306421572635
2014	622.827833456932
2015	644.1790638907491
2016	661.4893133086099
2017	676.4736236559709
2018	685.4629497755853
2019	699.7683272167025
2020	694.2786535972213
2021	722.6192449442119
2022	736.9322106384847
2023	752.0674595943364