Year	TDS, current US$
1970	13250000
1971	0
1972	7328475
1973	9539400
1974	7074712.5
1975	9256067
1976	8814724.2
1977	8379455.5
1978	8773649.4
1979	3551184.5
1980	3420000
1981	22460000
1982	5430000
1983	5450000
1984	5410000
1985	9430000
1991	205282.1
1992	1763582.9
1993	1389410.5
1994	4373518.9
1995	14139136.1
1996	9699375.8
1997	137609
1998	223868.3
1999	4416737.7
2000	7136558.6
2001	6466636.3
2002	5636176.8
2003	6683302.9
2004	10383754.1
2005	9821543.2
2006	1331238.4
2007	1388215.4
2008	712397.4
2009	1027493.1
2010	630543.9
2011	2406499.4
2012	12856210.8
2013	16561631.2
2014	22001229.5
2015	26916359.6
2016	29195399.1
2017	21726031.5
2018	18887009.7
2019	14890400.8
2020	7202157.2
2021	3830657.3
2022	7899707.8