Year	TDS, current US$
1971	4765000
1972	7741000
1973	5676000
1974	15776000
1975	6400000
1999	1929897.3
2000	2093099.5
2001	1038050.6
2002	949451.2
2003	802987.9
2004	1202980.4
2005	1583472.8
2006	2238780.1
2007	1976085
2008	461811.1
2009	1006644.3
2010	1375837.7
2011	470884.8
2012	128288
2013	551558.3
2014	212748.5
2015	195877.4
2016	328053.8
2017	206624
2018	373831.9
2019	3832789.4
2020	1218933.8
2021	424520.6
2022	8789646.1