Year	TDS, current US$
1970	2767721.6
1971	1201950.1
1972	1979700.1
1973	2657101.3
1974	3117624.1
1975	4490276.4
1976	2480466.9
1977	3888789.8
1978	4149260.1
1979	4014542.8
1980	12818596.4
1981	46575323.2
1982	20001434.7
1983	24144446.8
1984	21295378
1985	19964630.9
1986	62180703.8
1987	37086877.1
1988	5375885
1989	32220299.3
1990	10709952.1
1991	41056.4
1992	245098.6
1993	333737.8
1994	41529.8
1995	726756.8
1996	3359430.5
1997	42658.8
1998	187235.3
1999	1703366.6
2000	809143.4
2001	550540
2002	524000.5
2003	300802
2004	450640.6
2005	721702.9
2006	857783
2007	740248.2
2008	1829627.8
2009	167530.7
2010	228973.7
2011	78367
2012	220472.9
2013	585698.1
2014	34951.5
2015	32179.9
2016	54212.3
2017	34668.5
2018	62305.3
2019	638337.7
2020	820909164.3
2021	17392936.6
2022	19554763.9