Year	TDS, current US$
1971	501512.5
1973	2289456
1974	4413817.3
1975	2914920
1978	7260119.4
1979	5766430.3
1980	2138856.9
1981	6258040.1
1982	5129198.7
1983	1572470.5
1984	2958188.1
1985	4928436
1986	13714226.8
1987	15640620.3
1988	7016893.6
1989	11127152.4
1990	16265914.8
1991	9624994.5
1992	1370580
1993	3545440.5
1994	6120635.3
1995	9167148.8
1996	8839919
1997	10829828.5
1998	9968244.2
1999	8657040.6
2000	9623478.5
2001	9509452.5
2002	11464788.8
2003	13617853.5
2004	19997993.3
2005	27344153
2006	20921278.4
2007	22445135.1
2008	20501855
2009	13482103.2
2010	10757701.9
2011	6252844.5
2012	40707899.4
2013	202121.1
2014	77501.2
2015	30040604.9
2016	120935.1
2017	76270.6
2018	137354.9
2019	5486664.3
2020	60020298.5
2021	52106341.9
2022	34105379.2