Year	TDS, current US$
1970	3131843.5
1971	2332956.9
1972	1818743.9
1973	4832808.5
1974	4852696.9
1975	5852099.3
1976	4321683.5
1977	4328792.9
1978	5248314.8
1979	3754287.2
1980	9990508.6
1981	10797460
1982	8639694.5
1983	20832875.6
1984	24723545.4
1985	26234880
1986	28409417
1987	28060601.3
1988	27012330.3
1989	33578663.1
1990	29117739
1991	15108121.7
1992	15496246.9
1993	9241664.1
1994	23152474.1
1995	15681300
1996	12915696.3
1997	15593469.2
1998	33247649.1
1999	19050923.6
2000	14636548.9
2001	13540746.9
2002	1172586.1
2003	808564.7
2004	10748052.1
2005	6878445.1
2006	71344027.9
2007	89845392.7
2008	26956856.8
2009	31380646.1
2010	3358435.9
2011	1504811.4
2012	4638830.8
2013	6671256.3
2014	12050715.1
2015	17568691.7
2016	25252855.6
2017	35364506.7
2018	27032152.1
2019	30368100.6
2020	15094472.1
2021	17708844.7
2022	19767521.4