Year	TDS, current US$
1970	13660000
1971	15731000
1972	20693103.1
1973	26373422.8
1974	31842927.1
1975	37080865.8
1976	40770174.4
1977	50033755
1978	53584325.6
1979	67225689.3
1980	71108605.8
1981	73944921.9
1982	87939695.4
1983	100594473.4
1984	114888540.4
1985	130180781.6
1986	231425279
1987	347840636.4
1988	447430563.4
1989	431921473.5
1990	508775043.3
1991	645263123.4
1992	638444443
1993	643799007.2
1994	767133546.7
1995	793139705.3
1996	769459328.4
1997	746997887.1
1998	661602636.3
1999	693198450.9
2000	595128864.2
2001	463655820.8
2002	448314347.8
2003	487743961.4
2004	479042000.5
2005	464916938.4
2006	426262679.6
2007	381289074.2
2008	357090939.1
2009	261020955.4
2010	206711978.6
2011	213988680.5
2012	127485244.4
2013	191728556.3
2014	147966952.9
2015	153183898.6
2016	228396627
2017	208779238.8
2018	274195341
2019	354681862
2020	457289741.4
2021	512471096.1
2022	638510524.6