Year	current US$
1976	13977520.94
1977	8717079.163
1978	9158178.329
1979	9130308.151
1980	5445909.023
1981	4737266.541
1982	6099514.008
1983	4313142.776
1984	5354969.025
1985	5607313.156
1986	7007307.053
1987	13434066.77
1988	10012715.34
1989	7227381.706
1990	5436425.686
1991	21015235.9
1992	20734443.66
1993	20446674.35
1994	19904487.61
1995	15668252.94
1996	15166875.84
1997	13949213.98
1998	9713940.62
1999	7844246.387
2000	7226507.187
2001	5924500.942
2002	5622274.3497954
2003	6931479.34501589
2004	9526646.37595816
2005	6846522.7574852
2006	4412111.38028146
2007	7622440.28431522
2008	7350469.36324432
2009	4734583.32449348
2010	3501731.44591101
2011	12299746.0866075
2012	14254412.2154448
2013	14280890.1329704
2014	10474115.128356
2015	3944547.93526387
2016	2694279.50212762
2017	4262316.57269726
2018	3646878.5194992
2019	29347869.5042038
2020	2297150.99742108
2021	11901461.205
2022	3000000
2023	3081968.00249736