Year	TDS, current US$
1970	393000
1971	592000
1972	1254282.1
1973	1943563.6
1974	2052429.9
1975	3601265.9
1976	4283541.5
1977	4449192.3
1978	6889118.4
1979	9058910.5
1980	7568624.9
1981	8168123.9
1982	13364570.8
1983	13712219.9
1984	17288538.3
1985	16856920.3
1986	22321029.7
1987	4607430.5
1988	3961734.5
1989	1951485.4
1990	1915633.6
1991	16534781.2
1992	96000
1993	21423481
1994	13713667.1
1996	368494.3
1997	49000
1998	38000
1999	27000
2000	0
2001	0
2002	19000
2003	0
2004	0
2005	32501.4
2006	48556.5
2007	641260672.3
2008	106497359.5
2009	16097395.8
2010	4333869.6
2011	2973362.9
2012	2751214.5
2013	3936649.3
2014	12275075.3
2015	3350992.6
2016	3271331.5
2017	5023416.6
2018	6871761.4
2019	6494353.6
2020	18752845.7
2021	16414057.1
2022	28364185.9