Year	current US$
1971	253.33954561523285
1972	284.8284293955853
1973	366.6655083293756
1974	435.0063480384805
1975	520.3265633859359
1976	598.3281242010587
1977	773.6235846890532
1978	916.7858224181489
1979	994.6892676425635
1980	1059.9416461276608
1981	824.1414848977564
1982	711.9763484276751
1983	594.8780956450709
1984	593.7540794043126
1985	569.5829141360247
1986	750.9552716273648
1987	785.9028926908196
1988	772.4836834743538
1989	674.7426740722265
1990	709.382113197661
1991	680.4056145489665
1992	708.4216720296248
1993	672.9007186852567
1994	505.73277983508234
1995	656.8359949599247
1996	694.5179787644827
1997	660.2971903226139
1998	703.0519855506498
1999	665.2912286973781
2000	528.2273628606335
2001	531.832914901961
2002	569.5340144206393
2003	674.4414690435065
2004	740.2024071444913
2005	791.3772604420035
2006	794.2612152565706
2007	904.2111369435152
2008	1058.7422843284696
2009	1059.6737818052409
2010	1070.9502322354047
2011	1047.2789087661945
2012	1109.5762714038328
2013	1260.8533747247484
2014	2020.672247324646
2015	1835.537821409253
2016	1846.7729627161602
2017	1918.4515870685573
2018	2098.2320680677462
2019	2079.949481242538
2020	2126.8481003580328
2021	2334.270589552566