Year	TDS, current US$
1970	607000
1971	619000
1972	622000
1973	477000
1974	692000
1975	670000
1976	1389859.1
1977	2047697.6
1978	3186465.2
1979	4925391
1980	6454930.9
1981	7469558
1982	11378282.1
1983	13912622.1
1984	15112568.2
1985	19690446.4
1986	26367991.5
1987	35531541.7
1988	41863885.4
1989	41312707.4
1990	41598534.6
1991	47593600.2
1992	54278674.3
1993	47634250
1994	50110324
1995	49588512.5
1996	44907685.4
1997	43822791.6
1998	39991639.3
1999	41080126.1
2000	42621443
2001	32387364.6
2002	41491309.9
2003	37485729.7
2004	42101508.6
2005	37546162.8
2006	60811615.6
2007	34338443.4
2008	35615924.3
2009	32279143.2
2010	27003252.6
2011	29149406.8
2012	32190500.9
2013	33924953.9
2014	62095624.7
2015	47279209
2016	47070893.1
2017	174477767.4
2018	65072484
2019	78913200.6
2020	262625537.1
2021	63482447
2022	50841525.8