Year	TDS, current US$
1970	270283055.5
1971	224695281
1972	364046244.1
1973	441845400
1974	301610792.6
1975	305440220.3
1976	266772124
1977	498210026.8
1978	583016384.4
1979	518518468.3
1980	1235186590.4
1981	1551397107.5
1982	1714208248.3
1983	2079154738
1984	2421450078.1
1985	2814811681.7
1986	2703419543.9
1987	1661279118.8
1988	2488284739.7
1989	2929882142.6
1990	3073534034.3
1991	2612253086.7
1992	2679944451.3
1993	2202758535
1994	2225773798
1995	2380850036.1
1996	2328327176.5
1997	2112580379.1
1998	1896653192
1999	2131343502.1
2000	1841558183.8
2001	1989108070.7
2002	2079895002.6
2003	2684844907.3
2004	2174037183.1
2005	2286807101.5
2006	2487269988.8
2007	2893454700.9
2008	3292683653.5
2009	2968784832.3
2010	3064860540.6
2011	3745397812.5
2012	3242805021.8
2013	3436094295.2
2014	6002943603
2015	3782495128.7
2016	6635327342.8
2017	6706042603.4
2018	8573997535.6
2019	9047989793.8
2020	12447314109
2021	18433704315
2022	17941755835.2