Year	TDS, current US$
1970	34347450.9
1971	37900324.2
1972	61336160.5
1973	97787924.8
1974	187423536.9
1975	152012632.5
1976	115034634.8
1977	123966453.5
1978	155375239.3
1979	220240303
1980	542517684.5
1981	401387567.4
1982	222117040.5
1983	247237551.4
1984	414840483
1985	498222213.4
1986	455022415.3
1987	470363613.1
1988	391920365.2
1989	609006380.6
1990	348142201.4
1991	177430038.8
1992	77390180.6
1993	27511576.8
1994	15684988.3
1995	24967300
1996	48414485.6
1997	12519556.7
1998	19339789
1999	25096074.5
2000	29746098.2
2001	20219751.1
2002	928941221.6
2003	148230002.6
2004	133236373.4
2005	217647070.9
2006	289648504.1
2007	500821216.9
2008	592150074.6
2009	624518907.4
2010	274408365.1
2011	255389492.1
2012	228109543.1
2013	347581000.9
2014	359277291.8
2015	345247755.3
2016	432457534.8
2017	344420838
2018	326068252.4
2019	1057236533.4
2020	276637430.4
2021	326195031.9
2022	678373291.6