Year	TDS, current US$
1970	0
1972	1215984
1973	715455
1974	180401.3
1975	0
1976	0
1977	0
1978	0
1979	32301.3
1980	67682.4
1981	43653.7
1982	62943
1983	60940.1
1984	678727.1
1985	1769178.1
1986	3019801.5
1987	3353152.1
1988	3126684.8
1989	1876745.5
1990	540341.7
1991	101272.4
1992	45075.6
1993	87972.7
1994	70171.1
1995	230620.1
1996	1461947.5
1997	2175598.3
1998	3410938.6
1999	6423390.1
2000	8012098.9
2001	7724897.1
2002	8912165
2003	4253361
2004	3770061.7
2005	4484932.9
2006	695288.4
2007	687619.7
2008	349628
2009	483735.8
2010	1345830.7
2011	3893984.1
2012	7216314.9
2013	7856675.8
2014	10912476.1
2015	19814403
2016	20151678.5
2017	24719999.8
2018	34266512.7
2019	33443643.9
2020	28823952.6
2021	29351753.1
2022	26054448.9