Year	TDS, current US$
1970	55662326.3
1971	61419510.3
1972	73250733.3
1973	29036464.4
1974	36029379.4
1975	51359991.9
1976	65512865.1
1977	90613419.1
1978	120254363.4
1979	156032869.6
1980	193194540
1981	225503148.5
1982	289903536.8
1983	379222977.3
1984	415757568.7
1985	516822100.3
1986	749679899.6
1987	983560775
1988	1258404933.1
1989	1301787983.8
1990	1513606618.2
1991	1537263003.9
1992	1759988260.5
1993	1830371049.4
1994	1847988162
1995	1884615515.2
1996	1819696112.7
1997	1590702434.8
1998	1497442033.1
1999	1356189883.3
2000	1417033683.6
2001	1713061615
2002	1009877818.9
2003	999438002
2004	991051244.6
2005	1311512682.9
2006	1410413789.9
2007	1415519033.5
2008	1508134249.2
2009	1528211820.4
2010	1504653902.2
2011	1653919677.2
2012	1753725099.6
2013	1786796613.3
2014	2090382311.1
2015	1824782481.9
2016	2360175711.6
2017	3161891729.7
2018	2424568092.8
2019	2892948715.2
2020	2930321300.5
2021	3102354301.9
2022	2934630337.5