Year	TDS, current US$
1970	0
1971	130393.3
1972	141141
1973	155015.3
1974	156347.8
1975	2586991.5
1976	0
1977	3502.7
1978	15028.7
1979	1245538.6
1980	10593650.6
1981	10528601.5
1982	7761468.9
1983	9385171.1
1984	15879072.7
1985	19512500.7
1986	19126359.4
1987	15083944.7
1988	12629064.3
1989	14860132.7
1990	19001564.5
1991	14917167.7
1992	9005259.8
1993	6461108.1
1994	6255249.1
1995	9469079.1
1996	10592223.6
1997	7982698.2
1998	7450065.2
1999	10313084
2000	7094670.2
2001	6085043
2002	6507876.5
2003	8776894.1
2004	10146986.6
2005	10221573.1
2006	23705011.7
2007	569654.9
2008	198629.4
2009	302555
2010	305418.7
2011	104008.2
2012	1016290.1
2013	2962161.1
2014	3180589.4
2015	4473001.5
2016	10343425.4
2017	14258444.9
2018	20678287.7
2019	22202268.8
2020	20262161.9
2021	14294092.8
2022	11767259.2