Year	TDS, current US$
1970	205000000
1974	1403521.7
1975	20715364.8
1976	365761010.5
1977	344084352.5
1978	259600927
1979	101632849.7
1980	13917848.4
1981	66433867.6
1982	144973102.3
1983	350419617.4
1984	517568362.4
1985	601169965.1
1986	937851978.6
1987	1350591993.4
1988	1457915586.8
1989	1192297454.4
1990	844049057.6
1991	666204817
1992	606383743.3
1993	404603328.9
1994	1376813563.8
1995	1909473718.9
1996	1072721053.6
1997	668316007.4
1998	411890510.1
1999	306674094.7
2000	64929047.4
2001	19338390.9
2002	17687826.9
2003	14959283.4
2004	22410954.5
2005	29499348.1
2006	41707412.4
2007	36813526
2008	8603322.8
2009	14344354.4
2010	19605239.1
2011	6709954.9
2012	1828063.3
2013	7859526.8
2014	3022547.7
2015	2788455.4
2016	4671986.7
2017	2949592.7
2018	5324273.2
2019	54611031.9
2020	17374333.6
2021	12513385.7
2022	259449797.1