Year	current US$
1977	1385763.30639707
1978	1616689.00653406
1979	1902560.21582023
1980	2519494.75475874
1981	2880259.35214287
1982	3193624.79211672
1983	3591651.18649168
1984	4031503.78472811
1985	4925945.74968426
1986	5286436.43934335
1987	5624465.80335495
1988	6235602.78530994
1989	7415081.54054193
1990	8820099.54142436
1991	10877576.9264528
1992	11704196.1804761
1993	11941718.9557276
1994	12824887.1902796
1995	12460363.3646853
1996	12945843.5322636
1997	14768698.35281
1998	17810041.1728248
1999	18129853.3319631
2000	17153953.7238541
2001	22218763.8830203
2002	22792042.5297328
2003	23079285.8996277
2004	26371406.19568
2005	27673215.6107069
2006	32531504.4451591
2007	37186279.6241027
2008	43105628.2859778
2009	62124471.6485394
2010	68332918.621739
2011	83745504.0921619
2012	79692958.0039764
2013	78780054.4119315
2014	74255113.3310606
2015	76523346.9115716
2016	74270862.3560883
2017	70389523.3112176
2018	78067382.5855895
2019	86872106.1731787
2020	73838949.2603347
2021	83588036.2754732