Year	TDS, current US$
1970	27000
1971	42000
1972	665000
1973	1553000
1974	2253000
1975	3058000
1976	3639000
1977	4094000
1978	7081904.8
1979	7830144.2
1980	10380476.2
1981	6697770.2
1982	9647667.1
1983	11576626.9
1984	13562250.1
1985	20094588.7
1986	31622751.3
1987	51728915.4
1988	51016294.9
1989	48255465.4
1990	64389413.4
1991	61830043.9
1992	74406298.2
1993	69979474.2
1994	74611908.3
1995	69343459.5
1996	112314253.1
1997	67493276.4
1998	58399937.1
1999	57096139.2
2000	44268143
2001	35943739
2002	41512854.7
2003	33885046.5
2004	33230403.3
2005	36110498.1
2006	36963590.8
2007	30646941.3
2008	30515461.6
2009	26632549.1
2010	57148737.4
2011	38215034.3
2012	39902290.8
2013	166517910.9
2014	36946336.2
2015	129235870.7
2016	133512362.9
2017	146061326.6
2018	153050643.1
2019	164459033.9
2020	155822548.8
2021	136819442.1
2022	150946727.9