Year	TDS, current US$
1973	0
1974	770000
1975	1280000
1976	6600000
1977	59264000
1978	85432000
1979	83970000
1980	124140000
1981	136450000
1982	90620000
1983	122980000
1984	218120000
1985	256440000
1986	304840000
1987	345609114.7
1988	368529405.2
1989	139420143
1991	29386820.4
1992	278451705.6
1993	61020955.6
1994	190783667.3
1995	441485763.2
1996	394728734.8
1997	164646418.7
1998	154211329.4
1999	163216988.3
2000	124419407
2001	138147958.6
2002	111123036.7
2003	121531122.1
2004	187099765.5
2005	168172120.3
2006	181503230.3
2007	112646513.1
2008	959264.7
2009	80340169.6
2010	306050747.2
2011	468345066
2012	2428656584.5
2013	6543933417.5
2014	6000377164.6
2015	1736312264.9
2016	135048355.8
2017	730811.2
2018	1318324
2019	13518389.3
2020	4300398.3