Year	TDS, current US$
1971	7000
1972	22000
1973	36000
1974	40000
1975	106000
1976	70000
1977	200324.7
1978	197472.9
1979	149818.7
1980	393992
1981	451729.1
1982	965118
1983	1417520.6
1984	1331842.1
1985	2787139.8
1986	3915035
1987	4642290.7
1988	5678519.6
1989	8167483.9
1990	8324925.6
1991	7969340.8
1992	8023341.8
1993	5123764.1
1994	14293894.5
1995	6086562.9
1996	5126140.4
1997	6523678
1998	18554687.6
1999	9704591
2000	10349663.3
2001	9779728.9
2002	340189.8
2003	0
2004	798418.4
2005	862766.6
2006	63536851.9
2007	62007377.7
2008	13966993.9
2009	8368918.5
2010	121075.8
2011	101318.2
2012	2442214.1
2013	1330641.2
2014	728322.7
2015	862512.7
2016	1463194.8
2017	1564185.1
2018	3593403.7
2019	10418510.3
2020	2915035.5
2021	3176822.8
2022	4145738.6