Year	TDS, current US$
1975	607275
1976	0
1977	0
1978	1252.4
1979	1295485
1980	779111.1
1981	280618.5
1982	1259938.4
1983	387354.9
1984	1438396.6
1985	2829405.8
1986	2160070.9
1987	987608.1
1988	919454.9
1989	705061.5
1990	494181.8
1991	10948.4
1999	49270.3
2000	53237.7
2001	26402.7
2002	24149.1
2003	67983.1
2004	143230.6
2005	340175.4
2006	2077185.4
2007	2652779.2
2008	3094219.4
2009	2394086.3
2010	58074.9
2011	264807.7
2012	483024.6
2013	496206.9
2014	2711023.2
2015	4535962
2016	5051472.6
2017	4818916.1
2018	4927784.8
2019	2922260.1
2020	1934970.3
2021	2595558.8
2022	3911713.7