Year	current US$
1977	31287765.185185183
1978	36626074.81481481
1979	42612697.777777776
1980	51747898.518518515
1981	61861331.85185185
1982	68240521.48148148
1983	75236158.14814815
1984	80013044.8148148
1985	83913536.29629628
1986	90703145.55555555
1987	100354219.62962963
1988	108478743.7037037
1989	120481968.51851851
1990	136577777.77777776
1991	149740740.74074072
1992	160377777.77777776
1993	172162962.96296296
1994	180751851.85185185
1995	191244444.44444442
1996	204166666.66666666
1997	216337037.03703701
1998	230244444.44444442
1999	244785185.18518516
2000	274198592.5925926
2001	304520148.1481481
2002	322912000
2003	338406037.037037
2004	366037296.2962963
2005	386765703.7037037
2006	423535222.2222222
2007	454313481.48148143
2008	465090555.5555555
2009	449680629.6296296
2010	460728814.8148148
2011	465283814.8148148
2012	481354851.8518518
2013	503231851.8518518
2014	504259259.2592592
2015	509070370.3703703
2016	518896296.29629624
2017	535651851.8518518
2018	561155555.5555555
2019	586414814.8148148
2020	550188888.8888888
2021	555925925.9259259
2022	623866666.6666666
2023	684422222.2222222