Year	TDS, current US$
1970	37000
1971	52000
1972	118097.1
1973	259660.6
1974	306374.6
1975	325357.2
1976	309761.9
1977	860002.8
1978	913858.9
1979	1343823.1
1980	1594650.8
1981	1976973.1
1982	6219825.7
1983	4586595.6
1984	6775050.9
1985	15100584.4
1986	12593108
1987	8440737.6
1988	26452392
1989	20447083.3
1990	23266750.1
1991	15277221.1
1992	26285097.4
1993	25962312.8
1994	37959135.5
1995	35304112.6
1996	41165666.9
1997	40969715.1
1998	41492913.1
1999	47098894.5
2000	38403269.6
2001	33488679.9
2002	36206212.7
2003	40457281.4
2004	52655286.6
2005	54498921
2006	54579724
2007	31870568.1
2008	37765548.7
2009	47022381.5
2010	44573924.2
2011	44641556.1
2012	41975042.2
2013	69927368.7
2014	58837805
2015	54514870.4
2016	74661617.1
2017	82340833.9
2018	113713756.4
2019	122057041.4
2020	140700668.1
2021	160171739.7
2022	149562629.8