Year	constant 2015 US$
1970	1630.4083661047846
1971	1739.5519124461687
1972	1794.9329365691954
1973	1831.118614285199
1974	1827.095425546281
1975	1978.2197250406687
1976	2065.5372832187845
1977	2229.839537129353
1978	2364.8070015552667
1979	2382.6469629616117
1980	2250.512339480587
1981	2678.054385547133
1982	2916.1639539703056
1983	3058.3584039852617
1984	3286.1335971184258
1985	3214.615936376927
1986	3218.349010203959
1987	3251.823410755449
1988	3294.8269137855264
1989	3314.5023555528596
1990	3067.301593381585
1991	2730.8473091569604
1992	2228.9118096440525
1993	1966.0966137638186
1994	2068.6321585560154
1995	2091.4738014498103
1996	2166.2221056235876
1997	2209.2422471674777
1998	2243.47135575815
1999	2350.4308006023552
2000	2391.8592601413866
2001	2475.8462701926605
2002	2521.6222124053143
2003	2670.995373290684
2004	2705.824650214412
2005	2711.0304985259168
2006	3214.127850722137
2007	3260.2029552308522
2008	3200.7340307870454
2009	3227.552084735466
2010	3478.820451896966
2011	3524.9550666695477
2012	3636.265114312366
2013	3819.7551065521457
2014	3991.1887552143608
2015	4281.697871249943
2016	4458.186641948549
2017	4535.18545179299
2018	4640.278684605014
2019	4605.266263212672
2020	4211.117062781554
2021	4115.198809238218
2022	4216.68190154497