Year	TDS, current US$
1971	140423.5
1972	162855
1973	178863.8
1974	3511811
1975	170037
1978	3331364.1
1979	1615065.6
1980	3316920.6
1981	7010675.6
1982	528710.8
1983	768350.4
1984	4329844.8
1985	4984754.9
1986	2901625.8
1987	2018440.4
1988	2925050
1989	5096953.7
1990	3901864.6
1991	220336.1
1992	150721.5
1993	1855805.6
1994	2289867.9
1995	7947290
1996	7161655.6
1997	12099959.5
1998	11789039.6
1999	5568769.8
2000	1721764
2001	1813928.6
2002	8205167.3
2003	14088323.8
2004	13978163.8
2005	14227990.2
2006	16487905.2
2007	15489822
2008	14332991.5
2009	13048388.7
2010	11406607.6
2011	8100424.5
2012	4129626.4
2013	2962984.8
2014	1317520.8
2015	12508174.2
2016	62552.6
2017	40215.4
2018	72217.5
2019	736437.2
2020	3015990.4
2021	11715628.9
2022	25706503