Year	TDS, current US$
1970	24569000
1971	26326515.6
1972	29699873.6
1973	37582851
1974	51764929
1975	59749293.8
1976	70597743.10000001
1977	113244488.89999999
1978	223566931.7
1979	199297143.2
1980	411715867.7
1981	403492126
1982	470359547.6
1983	542969684.7
1984	729261504.8000001
1985	905525602.7
1986	1151418443.7
1987	1571923134.1000001
1988	1787337453.7000003
1989	1698281060.7
1990	2088464241.2999997
1991	2505778293.7000003
1992	2629533191.4
1993	2570695001.9000006
1994	2850103041.2000003
1995	3301749222.2000003
1996	3217274249.5999994
1997	3606318343.6000004
1998	3173725948.5
1999	3285619833.9
2000	3171166077.7
2001	3174976552.8999996
2002	3795868601.8
2003	4303713620.099999
2004	4421654318.5
2005	4319808805.000001
2006	5687864228.5
2007	3548929248
2008	3880494361.7
2009	3464840847
2010	3525596130.4
2011	3968543126.3999996
2012	3817240272.5000005
2013	4329620139.6
2014	4755458469.7
2015	4451008132.200001
2016	4286941733.2000003
2017	4527125867
2018	6593519831.2
2019	6356516511
2020	5306898295.799999
2021	7494569910.700001
2022	8211542516.3