Year	TDS, current US$
1970	4000000
1971	250756.3
1974	2982366.5
1975	2768804
1976	7855452.5
1977	6192725
1978	19173626.4
1979	3634973
1980	15910000
1981	15360000
1982	12130000
1983	21090000
1984	39260000
1985	35790000
1986	51030000
1987	74184558.5
1988	62067247.2
1989	38687365.5
1990	28836326.7
1991	11764034.3
1992	10170182.4
1993	4855256.7
1994	23945517.7
1995	46979741.5
1996	23382449.6
1997	705934.2
1999	1256977.1
2000	1358190.5
2001	673580.3
2002	616089
2003	521050.5
2004	780601.5
2005	1027499.1
2006	1452721.2
2007	1282260.9
2008	299664.5
2009	564415.2
2010	771418.1
2011	264020.3
2012	71929.8
2013	309253.1
2014	118531.3
2015	109131.7
2016	183487.7
2017	116486
2018	209572.5
2019	2148517.5
2020	1405604.8
2021	6770961.1
2022	26575029.3