Year	TDS, current US$
1970	454000
1971	485051.6
1972	1388646.8
1973	505000
1974	462000
1975	465000
1976	478000
1977	610589.9
1978	341246.1
1979	702843.1
1980	908291.9
1981	1053830.2
1982	1583590.4
1983	2106543.2
1984	6788948.6
1985	8557585
1986	10134310.8
1987	16187803.3
1988	14658780.6
1989	17112629.8
1990	20304383.9
1991	21676817
1992	23818821.1
1993	19589492.8
1994	24258337.6
1995	20288057.4
1996	20283140
1997	20884123.9
1998	19600235.4
1999	19952540.5
2000	13927380.3
2001	15423413.7
2002	16317203.2
2003	23925025.4
2004	53311597.4
2005	34061924.6
2006	14142602.2
2007	16334465.5
2008	16215443.5
2009	11592799
2010	3749048.1
2011	4655726.1
2012	10006973.8
2013	20251929.7
2014	8060958.9
2015	8108943.9
2016	8703901.2
2017	9954824.4
2018	11919831.9
2019	13114132
2020	12666677.9
2021	15744198.3
2022	19142753.1