Year	TDS, current US$
1970	3950000
1971	4012100
1972	1585122
1973	1466682.8
1974	1479290.3
1975	1493896.5
1976	2886362.5
1977	2335150
1978	1516647.3
1979	5185006.7
1980	3685428.4
1981	3416241.8
1982	2218156.1
1983	4711733
1984	8498766.3
1985	13559030.2
1986	27691245.8
1987	32881846.9
1988	28888900.6
1989	27323056.2
1990	21970728.6
1991	12409988.7
1992	8431954.6
1993	9957674.8
1994	10237815.1
1995	7426877.5
1996	8452292.4
1997	7802430.4
1998	11907079.2
1999	13533361.6
2000	18204354
2001	16050943.6
2002	19590171.9
2003	19424881.6
2004	19405836.8
2005	17612028.7
2006	1014005.2
2007	910476.3
2008	321109.4
2009	530449.4
2010	647915.2
2011	989565.2
2012	1877585.5
2013	4582179.6
2014	7967429.6
2015	7989001.6
2016	11455472.3
2017	16152729.5
2018	18101112.9
2019	20294164.2
2020	24350813.9
2021	21855687.9
2022	24546237.6