Year	TDS, current US$
1971	90272.3
1972	97713
1973	107318.3
1974	108240.8
1975	109309.5
1977	3794618.8
1979	1510409.4
1980	7696380.8
1981	8245509.1
1982	146866.9
1983	456516.4
1984	1166754.4
1985	2225445.2
1986	3133322.4
1987	4063077.2
1988	3724868.3
1989	4422658.5
1990	7991083.8
1991	5675366.5
1992	414132.1
1993	1024952
1994	3477047.9
1995	3374336.1
1996	852197.8
1997	3017765.4
1998	11312810.6
1999	5359573.5
2000	1134086.5
2001	2521657.2
2002	9197316.4
2003	8270528.5
2004	12654551.7
2005	12623728
2006	4829796.2
2007	705904.3
2008	310863
2009	484770.2
2010	397291.2
2011	134407.4
2012	2557815.2
2013	4935395.4
2014	5390134.1
2015	5469178.2
2016	3790689.6
2017	2405991.3
2018	2502125.2
2019	2930550.3
2020	1695362.7
2021	1038508.4
2022	3684210.7