Year	TDS, current US$
1981	380416
1982	369959
1983	416197
1984	669902.9
1985	1138561.3
1986	2036766
1987	2330018.3
1988	2702032.8
1989	3411142.8
1990	3422423.3
1991	3560899.4
1992	3904588.2
1993	4365479.5
1994	4413236.1
1995	3641465.6
1996	4015239.5
1997	5097002.5
1998	5549530.6
1999	5987665.2
2000	5871199.5
2001	8748704.6
2002	6944079.2
2003	8136752
2004	8446477.1
2005	11133955.4
2006	11204541.3
2007	10026614.6
2008	12148899.4
2009	10450196.5
2010	8981916.9
2011	8704587.5
2012	7957702.7
2013	7818890.4
2014	8038006.6
2015	10334013.3
2016	11517396.6
2017	12507126.9
2018	11740522.9
2019	11406878.1
2020	11418948.3
2021	11567484.7
2022	12228119.2