Year	current US$
1977	1965974.45
1978	988230.4668
1980	37864.5249
1981	11040.3122
1982	36517.8697
1983	20993.7375
1984	21151.9469
1985	21310.1581
1986	21468.3693
1987	21626.5805
1988	21784.7917
1989	21943.0029
1990	80803.6923
1991	141790.2112
1992	150354.7579
1993	158919.3046
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0
2022	0
2023	0