Year	TDS, current US$
1970	75000
1971	72000
1972	197608.1
1973	699702.6
1974	1117804.4
1975	1060970.5
1976	3398949.5
1977	3005254.4
1978	3722305.7
1979	4030885
1980	5308521.6
1981	4708146.3
1982	3995813.2
1983	5222960.9
1984	5724109.6
1985	7576475
1986	8109821.2
1987	7793814
1988	8496317.8
1989	6705152.5
1990	5442216.1
1991	4773535.7
1992	4796200
1993	4060577
1994	5091986.7
1995	4542497.5
1996	4650210.1
1997	4641902.9
1998	4126757.3
1999	4722773.2
2000	5539495.6
2001	4749734.7
2002	4773735.6
2003	5388222.2
2004	6113067.9
2005	5816055.3
2006	7026412.9
2007	6976927.8
2008	8062048.9
2009	8515382.1
2010	10621281.8
2011	11895847.1
2012	13343345.6
2013	15593825.1
2014	20281570.1
2015	23434035.9
2016	26478295.7
2017	31166285.2
2018	35911514.5
2019	36130326.4
2020	24571031.3
2021	17983185.8
2022	38402768.9