Year	TDS, current US$
1971	90272.3
1972	97713
1973	226560.8
1974	228508.2
1975	753021
1977	1167.6
1978	6262
1979	16796.7
1980	27333.3
1981	29495.8
1982	26502.3
1983	177474.7
1984	448041.9
1985	855627.8
1986	1163087.2
1987	1284938.3
1988	1127811.1
1989	740955.6
1990	260667.4
1991	143697.5
1992	112689
1993	153603.2
1994	1609638.3
1995	2958613.1
1996	3675919.7
1997	4414496.8
1998	4984800.5
1999	6243959.2
2000	5429384.1
2001	4530146.5
2002	3999820.6
2003	2735636.4
2004	843273.6
2005	342159.9
2006	923439.9
2007	3058718.6
2008	5192583.6
2009	6191302
2010	7642148.2
2011	7229751.6
2012	4839999.4
2013	2724443.2
2014	1619927.5
2015	1113703.2
2016	2996966.1
2017	6549565.8
2018	11962622.4
2019	14435826.9
2020	13245282.5
2021	12623077.2
2022	8599614.1