Year	TDS, current US$
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	30057.4
1979	65894.7
1980	2067555.3
1981	3763377.9
1982	11194658.4
1983	29111124.5
1984	36120909.3
1985	42178722.6
1986	42385506.6
1987	24932518.9
1988	20846357.6
1989	26723112.8
1990	27186791.1
1991	6370588.5
1992	16903.4
1993	156396
1994	126021.5
1995	335309.5
1996	358590.9
1997	407322.6
1998	4496360.6
1999	10738664.2
2000	14099298.2
2001	12676014
2002	12263429.5
2003	9389042.1
2004	10225518.7
2005	5144312.5
2006	695087.8
2007	603137.2
2008	140953.1
2009	865407.9
2010	648765.2
2011	215774.8
2012	58785.9
2013	252742.1
2014	5177385.6
2015	35631506.9
2016	52188357.2
2017	52008239.2
2018	53181842.9
2019	48863229.5
2020	20882076.7
2021	6229626.1
2022	15720458.7