Year	TDS, current US$
1970	4000
1971	44075.8
1972	28239
1973	5403096.3
1974	1774614.1
1975	9949976.3
1976	643269.2
1977	811703.2
1978	1620346.7
1979	3635588.3
1980	4462564.8
1981	6206419.5
1982	10107652.4
1983	16513558.8
1984	19039358.2
1985	42987226.6
1986	30128168.5
1987	45964730.8
1988	75500463.2
1989	43862556.4
1990	86665922.8
1991	50035371.1
1992	57223217.1
1993	86445838
1994	65458330.6
1995	50598609.5
1996	76749618.2
1997	58123251.8
1998	55782537.5
1999	63125699.2
2000	47358509.5
2001	33718065
2002	27724801.6
2003	26276267.4
2004	27133028.4
2005	33114788.6
2006	56330084.7
2007	105494206.5
2008	41989671.6
2009	49804111.4
2010	80880937.3
2011	97955944.8
2012	118691938.6
2013	117619120.6
2014	153701688.5
2015	157575644.9
2016	140237563.6
2017	192425232.9
2018	238224144.6
2019	217451505.3
2020	194154663.4
2021	290960184.9
2022	188068435.8