Year	TDS, current US$
1970	259000
1971	415137.8
1972	644305.5
1973	655810.4
1974	737549.7
1975	1426636.9
1976	1482114.3
1977	622375.5
1978	1118663.3
1979	1986443.4
1980	2361251.7
1981	1504835.4
1982	2818529
1983	4672593.4
1984	5119294.4
1985	6224125.2
1986	6403145.6
1987	5898766.4
1988	7192954.6
1989	4547567.1
1990	4135400.3
1991	3983994.4
1992	6478177
1993	8949871.1
1994	9514189.4
1995	7981124.9
1996	8381447.8
1997	7393237.1
1998	11440583.6
1999	11898991.9
2000	14528672.3
2001	17234140.6
2002	28417235.8
2003	31116962.7
2004	29484243
2005	10621269.5
2006	15044170.2
2007	19313123.4
2008	21363337.5
2009	22880146.3
2010	26036959
2011	25190000.1
2012	15053661
2013	22548869.8
2014	21008736.3
2015	26962965.3
2016	52166111.2
2017	59888992.2
2018	55815704
2019	54252220.2
2020	49281770.5
2021	51959279.9
2022	51933241.9