Year	TDS, current US$
1970	1344951
1971	3419393
1972	2651587.8
1973	140749
1974	471540.6
1975	413915.7
1976	3348503.5
1977	1321602.3
1978	1775070.5
1979	5415489.4
1980	7609658.8
1981	8309262.1
1982	7332463.7
1983	9295007.8
1984	12634959
1985	17902882
1986	19924365.5
1987	23839117.6
1988	22697277.3
1989	28975660.5
1990	20998827.5
1991	23368060.7
1992	21250254
1993	21506591.9
1994	4180535
1995	20240696.4
1996	17595019.9
1997	22226362.3
1998	20765453.4
1999	32775703.2
2000	36408265.4
2001	20518275.6
2002	18963986.2
2003	22355367.2
2004	26736386.5
2005	28239719.5
2006	26768806.4
2007	23588335.5
2008	47852285.8
2009	39499847.5
2010	51950487.4
2011	46473003.2
2012	85348722.6
2013	109241101.7
2014	169480057.9
2015	184681575
2016	222237477.7
2017	244687549.9
2018	262954738.8
2019	324974225.7
2020	283682890.2
2021	620215595.7
2022	348345003.4