Year	TDS, current US$
1976	0
1977	235837.9
1978	8381278.6
1979	1845692.4
1980	1377078.8
1981	2281920.1
1982	6715295.7
1983	6597722.2
1984	7438995.3
1985	7811178.9
1986	3840013
1987	4765565.9
1988	4765626.3
1989	10788010.5
1990	13378822.8
1991	6316544.2
1992	1319709.9
1993	2323274.3
1994	5411810.7
1995	8153453.2
1996	8006650.7
1997	7471961.6
1998	6707437.2
1999	6399185.4
2000	4965721.9
2001	4553517
2002	4587108.2
2003	3316898.1
2004	1124738.7
2005	489863.7
2006	612490.6
2007	705926.5
2008	500715.7
2009	2826119
2010	4695190.7
2011	4611804.9
2012	10405575.1
2013	15301222
2014	13050598.1
2015	14010834
2016	17917854.4
2017	12407149
2018	8167661.7
2019	8816521.1
2020	9236035.3
2021	10322403.5
2022	8196800