Year	TDS, current US$
1970	592086.6
1971	1109407.3
1972	2294577.8
1973	3637910.5
1974	5941504.3
1975	11514070
1976	15915023.9
1977	19900522.8
1978	29481754.1
1979	40948536.5
1980	49061983.4
1981	61696738.4
1982	67218946.2
1983	86505388.2
1984	125924718.4
1985	147383492.5
1986	195093989.1
1987	259394290.5
1988	374073297.3
1989	333599294.3
1990	405922258.1
1991	469389963.5
1992	475914878.3
1993	458030224.2
1994	519167472.3
1995	457261767.8
1996	516261279.8
1997	429062650.9
1998	394387969.6
1999	366906394.6
2000	221281918.1
2001	173245618.7
2002	371204948.7
2003	143349486.7
2004	94113674.7
2005	22754898.9
2006	14210966.5
2007	146582131.7
2008	768203388.8
2009	742013529.3
2010	148132147.5
2011	137107846.6
2012	83382372.4
2013	48663606.3
2014	80366046.5
2015	55229651.1
2016	63734358.8
2017	57156244.6
2018	79353315.2
2019	96050783.8
2020	165488702.6
2021	220165774.6
2022	247716040.3