Year	TDS, current US$
1970	31000
1971	30000
1972	42000
1973	53000
1974	37000
1975	46000
1976	128000
1977	200000
1978	312053.1
1979	388764.7
1980	545485.2
1981	741684.8
1982	928382.1
1983	1693189.6
1984	2528057.8
1985	6082629
1986	8208104.8
1987	8311358.1
1988	9640579.4
1989	10380492.3
1990	10153993.6
1991	12231083
1992	13808694
1993	12354726.1
1994	14221218.7
1995	22727304.5
1996	17280122.6
1997	22405218.9
1998	24423869.3
1999	25065423.9
2000	21794301.2
2001	23173410.4
2002	42784482.2
2003	39047010
2004	23229826.8
2005	25213921.1
2006	24783586.5
2007	27330233.5
2008	23051627.5
2009	26290313.9
2010	21683854.3
2011	27105762.8
2012	28443174.7
2013	30311774.4
2014	32113567.6
2015	36774196
2016	44240651.5
2017	37689023
2018	47195227.4
2019	48524018.2
2020	50021051
2021	287134871.1
2022	264778281.5