Year	TDS, current US$
1970	134105
1971	200367.4
1972	258138.5
1973	433944.7
1974	472348.7
1975	857366.8
1976	1420392.9
1977	1571051
1978	1746481.9
1979	2144992.6
1980	3136447
1981	3150744.4
1982	3261904.2
1983	4230618.2
1984	4312909.6
1985	4078199.3
1986	7268409.7
1987	12731288.7
1988	13461658.1
1989	11521419.4
1990	11033071.1
1991	10416040.3
1992	10056233.1
1993	8507183
1994	10724479.3
1995	11143769.1
1996	11625216.9
1997	6790884.3
1998	5054935.8
1999	9663796.2
2000	15086180.1
2001	12244365.5
2002	13272678.1
2003	16111487.9
2004	19685743.5
2005	17796132.2
2006	26218702.3
2007	30524296.8
2008	34006348.8
2009	33887520.2
2010	35743685.4
2011	39630446.2
2012	42151907.1
2013	41356191.9
2014	38278032.6
2015	44169923.2
2016	58871186.4
2017	71874727.9
2018	73209523.9
2019	79649957.5
2020	70632571.1
2021	61173116
2022	77560906.7