Year	TDS, current US$
1970	4659813.2
1971	4815800.4
1972	2559099.4
1973	6531670.7
1974	4073455.8
1975	4721318.7
1976	6897778.2
1977	9274902.9
1978	8467231.2
1979	13137680.9
1980	16367834.3
1981	20794888.5
1982	19526327
1983	20279080
1984	30859649.4
1985	53094799.1
1986	61679634.1
1987	69485155.9
1988	78196826.1
1989	69588354.3
1990	67830213.7
1991	45321876.1
1992	58484057.8
1993	78721224.7
1994	88198823.1
1995	86761480
1996	116433875.3
1997	84852345
1998	82018995.4
1999	106550956.6
2000	93739076.6
2001	80313969.1
2002	81462785.4
2003	76095362.9
2004	98166189.6
2005	99123228.6
2006	84369338.5
2007	63694011
2008	69119090.8
2009	68491130.7
2010	68949763.6
2011	70426908.8
2012	60354104.1
2013	110595447.4
2014	108983143.6
2015	113636041.7
2016	132849385
2017	162734175.5
2018	182125644.3
2019	211215323.7
2020	257750730.3
2021	292837692.1
2022	314042451