Year	TDS, current US$
1972	173712
1973	95394
1974	96214
1975	1408878
1977	2335.2
1978	2204210.8
1979	4555777.1
1980	459936.5
1981	720114.2
1982	3887544.9
1983	5255898.8
1984	4651564.8
1985	5171239.3
1986	21070366.6
1987	10422277.6
1988	7408065.3
1989	6500667.1
1990	6659236.4
1991	6716831.1
1992	3393347.5
1993	2563776.7
1994	4085674.4
1995	6379983.6
1996	7560896.4
1997	6445605.7
1998	4942740.4
1999	3842934.1
2000	1949821
2001	454746.5
2002	274116.8
2003	183801.9
2004	11590354.8
2005	2363917.6
2006	4454094.8
2007	4055005.5
2008	116844.2
2009	218393
2010	149751.7
2011	50208.4
2012	320021.1
2013	1578518.1
2014	3230737.3
2015	5399222
2016	5978641.7
2017	7292857.5
2018	7871711.4
2019	6731561
2020	6580849.2
2021	5383434
2022	4107098.7