Year	TDS, current US$
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	9410654.5
1978	3306316.2
1979	4819355.8
1980	3400000
1981	13080000
1982	14010000
1983	14580000
1984	37734281.5
1985	48604185
1986	67077639.3
1987	54213656.9
1988	58833023.9
1989	64991287.1
1990	60644532.8
1991	40381731
1992	19341658.5
1993	15864415.2
1994	12602150.4
1995	15167823.2
1996	17402547.1
1997	18103840.3
1998	14233952.6
1999	13580699
2000	6567745.3
2001	1880002.5
2002	2788411.7
2003	4748281.2
2004	7912159.5
2005	12211519
2006	1299068.3
2007	1245047.2
2008	646476.9
2009	918867.7
2010	2319643.4
2011	3776754.6
2012	7139502
2013	10843443.3
2014	19656437.6
2015	16509670.7
2016	14880576.5
2017	11526570.1
2018	8500428.7
2019	5827940.1
2020	9022895.9
2021	22151997.6
2022	26067831.4