Year	constant 2015 US$
1972	1608.508540458452
1973	1795.2283971336383
1974	2123.8104806189735
1975	2139.1419819415996
1976	2351.2004595326903
1977	2300.0612455292217
1978	2166.2679559428257
1979	2173.403078586757
1980	1944.172265956885
1981	1886.833008822683
1982	2034.7254596701061
1983	2081.4838316256432
1984	2079.82584465231
1985	2075.283807587157
1986	1962.3582557085272
1987	2066.0264678577414
1988	1908.515091504288
1989	1954.59719550306
1990	1992.4100818040658
1991	2018.16836542251
1992	2041.355804877658
1993	2118.334682349538
1994	2126.540267416515
1995	2115.053115968088
1996	2198.726914261951
1997	2198.0809930444757
1998	2223.3027524949316
1999	2315.7768996909795
2000	2358.996128621211
2001	2413.2862621772474
2002	2484.4007653742383
2003	2552.742940976172
2004	2650.844856925186
2005	2748.630349020558
2006	2856.314183144366
2007	3022.587876522413
2008	3110.9039802604575
2009	3114.0863201447687
2010	3205.3752009618547
2011	4169.539706969913
2012	4078.498692555426
2013	3982.3732803771973
2014	3933.550309142153
2015	3827.6836253112265
2016	4001.890316205186
2017	4063.4521924967185
2018	4008.117763313865
2019	3915.940486123591
2020	3663.8706123150905
2021	3895.095703905463
2022	3992.099196863633