Year	current US$
1977	4351851.85185185
1978	6600000
1979	12418518.5185185
1980	11066666.6666667
1981	13388888.8888889
1982	17374074.0740741
1983	15822222.2222222
1984	18377777.7777778
1985	21074074.0740741
1986	22592592.59259257
1987	23759259.25925924
1988	25629629.62962963
1989	28074074.074074082
1990	30414814.81481478
1991	33725925.92592588
1992	33003703.703703657
1993	35833333.333333336
1994	40148148.14814818
1995	37488888.88888886
1996	44559259.259259276
1997	54859259.25925926
1998	64325925.92592597
1999	78207407.4074074
2000	95697650.8166885
2001	95075367.35389373
2002	97177106.28817193
2003	100254761.5240057
2004	103137904.34130129
2005	114519604.11291926
2006	121840105.3676963
2007	136050446.27348486
2008	149761397.6995455
2009	138192622.80063805
2010	137029886.2762687
2011	139534750.958782
2012	145524951.2670425
2013	155387058.87974614
2014	162499183.00262997
2015	179546578.1010725
2016	197157596.34174
2017	211139119.5285914
2018	232998189.65949017
2019	255415175.31574607
2020	194881943.137024
2021	225091803.72524706
2022	268937254.8148144
2023	309020938.51851815