Year	TDS, current US$
1976	70000
1977	890000
1978	846000
1979	306460.3
1980	741714.3
1981	1291798.3
1982	1123189.5
1983	1380562.3
1984	1486078.7
1985	2330422
1986	2664765.4
1987	3845646.2
1988	4337838.3
1989	2297218.5
1990	992436.7
1991	655534.2
1992	239464.2
1999	60276.3
2000	65373.6
2001	32421.3
2002	29654.1
2003	25079.6
2004	37572.6
2005	49456.5
2006	69923.6
2007	61718.9
2008	14423.8
2009	43075.9
2010	56183.6
2011	18706.8
2012	5096.5
2013	21911.6
2014	9117.8
2015	1631379.3
2016	1624978.4
2017	1616937
2018	2478052.7
2019	3357490.4
2020	1664715.3
2021	1672440.2
2022	1969908.5