Year	TDS, current US$
1970	64000
1971	113000
1972	261000
1973	516000
1974	751000
1975	1214847.2
1976	1590859.1
1977	2521205.7
1978	2524395.8
1979	3669258.9
1980	5278051.2
1981	5812901
1982	5779707.4
1983	9382420.8
1984	10433928.5
1985	9692069
1986	10875611.2
1987	8272518.4
1988	10100127.7
1989	13474582.5
1990	102499711.3
1991	44790494.8
1992	49952876.7
1993	57547203.3
1994	49113432.4
1995	53549488.7
1996	54741436.3
1997	62795271.4
1998	69778762.9
1999	41657539.4
2000	32016815.7
2001	29607759.6
2002	33400021.3
2003	37136520.1
2004	37610567.7
2005	21001106.8
2006	24741471.9
2007	20391821.2
2008	21697896
2009	13545491.8
2010	16187062.3
2011	18100206.1
2012	19215880.3
2013	22628983.6
2014	25809505.4
2015	29474360.2
2016	32279316.1
2017	34969343.5
2018	39369635.3
2019	41847665.8
2020	44926674.5
2021	46680263.3
2022	50449095.1