Year	TDS, current US$
1977	19380000
1978	260495556.3
1979	178390613.6
1980	138300000
1981	69755000
1983	25880000
1984	114530000
1985	202150000
1986	412970000
1987	650223326.5
1988	902556683.3
1989	1217614290
1990	1712398558.2
1991	1645503193.7
1992	1398535305.5
1993	1601356381.2
1994	1437349711.4
1995	1688935664.4
1996	2702799800.8
1997	3921577210.5
1998	1486665868.6
1999	5386931362.6
2000	5662414426.6
2001	8233657
2002	7530900.6
2003	6369175.6
2004	9541854.5
2005	12559861.6
2006	17757657.7
2007	15674000.3
2008	3663014.6
2009	10280517.7
2010	14050964
2011	4808986.7
2012	1310162.7
2013	5632878.4
2014	2166995
2015	1999349.1
2016	3348651
2017	2114776.2
2018	3816201.2
2019	39138942.5
2020	12451234.3
2021	8615773.7
2022	178638047.9