Year	TDS, current US$
1978	3000
1979	4000
1980	8000
1981	27000
1982	86000
1983	1047806.5
1984	1871524
1985	2245854.3
1986	5900789.4
1987	1465005.9
1988	1464097.2
1989	1689893.1
1990	1792707.5
1991	1688875.4
1992	1714662.2
1993	2022069.7
1994	2154433
1995	2323963
1996	2518062.1
1997	2610735.1
1998	2868562.7
1999	3542588.2
2000	3825256.9
2001	3994795.4
2002	4536927.4
2003	4783922.6
2004	6251587.2
2005	6189907.7
2006	6469942.7
2007	12014807.8
2008	19654737.4
2009	17860934.9
2010	21576587.9
2011	23620044.6
2012	17983364.3
2013	17764199.7
2014	13528673.6
2015	19163968.2
2016	21160488.4
2017	17027258
2018	180234181.4
2019	184085857.8
2020	96754180.2
2021	149568487.2
2022	45335304.3