Year	TDS, current US$
1970	374000
1971	541000
1972	618206.3
1973	954585.7
1974	958895
1975	1256893.4
1976	1446039.6
1977	2158948.2
1978	2052912.7
1979	3040741.5
1980	2024745.8
1981	3057799.6
1982	2571536.7
1983	2519062.3
1984	8375254.5
1985	1911486.7
1986	4131182
1987	2429563.2
1988	7314863.2
1989	552994.1
1990	4283533.5
1991	2572401.6
1992	18963240.6
1993	4945494.9
1994	6055918.1
1995	6384988.1
1996	7230819.1
1997	5413407.1
1998	14246518.3
1999	7266900.7
2000	10992496.7
2001	8336874.9
2002	7854843.4
2003	8139493.5
2004	7670780.7
2005	7674834.4
2006	11457171.3
2007	5281914.6
2008	3496971.1
2009	4638842.1
2010	6693257.2
2011	9542552.2
2012	9709329.1
2013	12444779.8
2014	16137980.7
2015	15050485.4
2016	23110415
2017	24544127.1
2018	25666619.1
2019	30891934.1
2020	33910101
2021	33110809.9
2022	41380170.8