Year	TDS, current US$
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	9410477.3
1979	1962627.7
1980	87206.2
1981	1150846.9
1982	2032819.7
1983	2114949.5
1984	9957201.5
1985	15455867.2
1986	11916914.2
1987	23493021.3
1988	32121779.7
1989	28322961.4
1990	19813434.7
1991	11171453.2
1992	12197175.9
1993	9618351.4
1994	7151720.3
1995	11632659.7
1996	12194994.2
1997	12071061.7
1998	11950496.1
1999	10475094.9
2000	10373070.8
2001	10884613
2002	9992607.7
2003	14038786.9
2004	16626172.1
2005	11803536.2
2006	7113811.3
2007	7261707.9
2008	1959647
2009	589851.3
2010	351173.8
2011	118623.6
2012	32317.9
2013	1913965.2
2014	12278625.1
2015	16281613.3
2016	24160607.2
2017	26514439.4
2018	25236488.7
2019	16216816.7
2020	11952516.2
2021	1413169.3
2022	6676544.6