Year	TDS, current US$
1993	1059861.9
1994	3257942.3
1995	3729369.8
1996	7007766.4
1997	12790756.8
1998	14159329.8
1999	13903439.2
2000	18367917
2001	20975007.3
2002	26774592.4
2003	35160755.5
2004	36042783.1
2005	35600246.3
2006	33310893.8
2007	29887627.9
2008	25231772.1
2009	27130848
2010	21962233.3
2011	24287980.6
2012	20681814.5
2013	17426728.6
2014	20315957.7
2015	15507897.3
2016	20909260.3
2017	25395341.4
2018	29393953.1
2019	26687212.7
2020	26055928.1
2021	27736295.4
2022	28427171.5