Year	TDS, current US$
1970	4000000
1971	631905.8
1974	3656132
1975	6680025
1977	11675.8
1978	26300.2
1979	59434.4
1980	3169872.9
1981	22289552.9
1982	20515796.1
1983	29476516.4
1984	49528022.9
1985	65822990.8
1986	59648905.2
1987	44744932
1988	51040508
1989	44617573.7
1990	48489559.5
1991	23005283.5
1999	830989.6
2000	901262.4
2001	446971.6
2002	408821.8
2003	345756.5
2004	517988.3
2005	681823.6
2006	963990.6
2007	850877.4
2008	198850
2009	349050.5
2010	477067.1
2011	163277.7
2012	44483.5
2013	191251
2014	72942.3
2015	68557.1
2016	113984.8
2017	72110.4
2018	128858.7
2019	1329179.3
2020	422099.3
2021	176646.2
2022	3654769.1