Year	TDS, current US$
1970	21138413.3
1971	20195259.5
1972	21391728.9
1973	22074834.4
1974	21117060.7
1975	25416769.9
1976	24142042.1
1977	25150245.1
1978	27162620
1979	28648929.2
1980	44799189.1
1981	57883300.8
1982	75786613.6
1983	107480809.7
1984	130042300.5
1985	158791438.5
1986	224622237.7
1987	248942068.4
1988	309391666
1989	304091440.6
1990	236158220.3
1991	137920135.5
1992	109543841.7
1993	95000023.7
1994	112256872.8
1995	154619272.5
1996	348056270.7
1997	99976106.8
1998	119005064.9
1999	156410890.3
2000	138555594.8
2001	183023077.6
2002	85783572.2
2003	92739955.2
2004	96523160.7
2005	88313921.1
2006	133643624.6
2007	125696778.7
2008	103472657.5
2009	95805491.8
2010	179341010.1
2011	343948921.2
2012	428829389.3
2013	653994341.6
2014	759224077.2
2015	1102321466.4
2016	1238898616.5
2017	1482278134.7
2018	1652877614.2
2019	2165473749.8
2020	1997366859.3
2021	2025096358.9
2022	2023275956