Year	TDS, current US$
1970	62519.7
1971	58782.8
1972	75376.2
1973	119514.7
1974	156640.9
1975	525249.4
1976	529168.1
1977	922917.3
1978	183904.2
1979	248305.5
1980	403882.5
1981	796487.9
1982	878681.9
1983	1506411.5
1984	2791052.9
1985	2181886.5
1986	2172357.6
1987	1629669.7
1988	1034050.7
1989	1528968.2
1990	1109305
1991	8137842.3
1992	5680751.9
1993	2170882
1994	2792628.2
1995	964758.5
1996	1428353.2
1997	2730256
1998	2388187.6
1999	3613839
2000	3256025
2001	2843689.6
2002	4720269.9
2003	3054724.7
2004	3307048.1
2005	4032130.1
2006	3756429
2007	26173456.5
2008	12367449.3
2009	11866146.8
2010	4298754.2
2011	3941055.9
2012	12343028.2
2013	589435.3
2014	782360.6
2015	7423546.7
2016	6371827.5
2017	4004480.3
2018	6099966.5
2019	6074525.3
2020	6336720.3
2021	3564344.4
2022	4794345.5