Year	TDS, current US$
1970	18458903
1971	8542674.2
1972	10688502.3
1973	12851196.7
1974	16145710.1
1975	15538366.2
1976	22005339.5
1977	17120175.5
1978	42979005.6
1979	54042464
1980	75829840.9
1981	75951278.4
1982	41029318.9
1983	33735509.7
1984	44234131.8
1985	23817008.1
1986	60588556.2
1987	16422612.9
1988	18498283
1989	7456507.4
1990	21281872.1
1991	15383468.6
1992	34670336.1
1993	31304396.1
1994	158946107.7
1995	82929296.5
1996	65693391.5
1997	15682513.2
1998	25598734.3
1999	30567574.8
2000	47697607.1
2001	96305782.2
2002	15704760.3
2003	18854526.8
2004	22160646.6
2005	18355670.1
2006	24672293
2007	10673176.4
2008	5911045.8
2009	7945164.8
2010	11614035.9
2011	18666727.3
2012	20766525.1
2013	27440494.5
2014	35217184.1
2015	51868180
2016	37506505
2017	57442215.9
2018	61244647.2
2019	74357207.8
2020	96510703.7
2021	101713779.8
2022	110496097.8