Year	TDS, current US$
1973	0
1974	770000
1975	1280000
1976	8123000
1977	75973000
1978	114330000
1979	141928000
1980	1528976903.7
1981	2057387692.6
1982	2910161479.9
1983	1875338647
1984	2116367670.6
1985	2063868223
1986	1980644075.5
1987	2492754075.5
1988	4139731499.7
1989	1940879143
1990	18400000
1991	122010820.4
1992	464338061
1993	362564098.2
1994	626104703.5
1995	996903671.7
1996	4564802643.6
1997	3321016031.3
1998	2419431843.6
1999	3713846507.8
2000	2504258801.1
2001	2561515904.5
2002	3226052709.2
2003	3576953402.7
2004	4728464093
2005	6911047065.7
2006	8643911939.3
2007	11596767221.5
2008	18028989638.1
2009	16251985828.9
2010	18477258733.9
2011	18935993300.3
2012	20962392449.1
2013	28836518112.1
2014	24636292460.2
2015	23705417383.9
2016	18824516182.3
2017	20553697045.5
2018	21900795620.6
2019	19222866016.6
2020	20347106126.1
2021	21591167505.2
2022	18749187726.7