Year	TDS, current US$
1970	0
1971	140423.5
1972	151998
1973	166939.5
1974	168374.5
1975	170037
1976	1535544.9
1977	0
1978	1327536.1
1979	3109970.4
1980	6507269.7
1981	4779048.6
1982	2230672.8
1983	2200046.2
1984	9620855.5
1985	13498116.8
1986	11342148.8
1987	8437892.7
1988	12634441.2
1989	15376750.4
1990	10981970.2
1991	4094694.1
1992	1948111.2
1993	1788778.7
1994	5417492.6
1995	8382737.1
1996	7013573.5
1997	8184983.4
1998	13404961.5
1999	5590300
2000	1447878.3
2001	338575.8
2002	480396.3
2003	375441.4
2004	2990723.5
2005	5714874
2006	7507176
2007	27613015
2008	8114819
2009	19868338.7
2010	270637.6
2011	90015.2
2012	24523.8
2013	2365242.4
2014	5406850
2015	14096180.7
2016	19417727.5
2017	16908502
2018	14670072
2019	13306991.7
2020	10601241.1
2021	10236929.6
2022	12570210.9