Year	TDS, current US$
1977	560436
1991	2737.1
1992	7043.1
1993	5585.6
1994	14320.6
1995	16689.6
1996	15969.6
1997	262833.2
1998	257787.7
1999	480989.1
2000	642476.5
2001	598322.5
2002	372101.4
2003	394807.8
2004	223641.8
2005	31025
2006	43864.6
2007	38717.5
2008	9048.2
2009	1793717.3
2010	43430.4
2011	14342
2012	4550027.3
2013	16799
2014	6078.5
2015	366570.7
2016	1834877.2
2017	2044052.5
2018	3193147.9
2019	3907400.3
2020	3013204.3
2021	1974448.1
2022	3130173.8