Year	TDS, current US$
1977	0
1978	500957
1979	2000
1980	1170095
1981	1747245
1982	2424999.6
1983	2636696.3
1984	3151105.2
1985	2797582.3
1986	1341232.9
1987	3236281.4
1988	2454445.9
1989	5968935.9
1990	2837105
1991	1897604
1992	2504538.4
1993	2699559.4
1994	2803382
1995	2327947.2
1996	3053573.2
1997	3603388
1998	3787010.6
1999	4407752
2000	4349919.2
2001	3479780.4
2002	3905650.5
2003	4623400.4
2004	6517504.2
2005	6654194.9
2006	7055129.4
2007	6472097.1
2008	2333762.1
2009	2100949.8
2010	1651307.7
2011	1665757
2012	11434031.6
2013	5918936.6
2014	13810120.3
2015	2768639.8
2016	2627008.2
2017	3846315.8
2018	4645087
2019	8873724.5
2020	3046043.7
2021	3187681.5
2022	8041437.2