Year	TDS, current US$
1985	288598.9
1986	312380.4
1987	415838.6
1988	450168.8
1989	592909.7
1990	720319.5
1991	743562
1992	687542.6
1993	815471
1994	1112455.8
1995	1289249.9
1996	1504441.9
1997	1385985.9
1998	1416986.8
1999	1567027.3
2000	1563546.1
2001	1627824
2002	1446854.7
2003	1916569.9
2004	2264911.9
2005	3522753
2006	2717090.6
2007	2924570.4
2008	3148060.6
2009	2170340.9
2010	2588451.6
2011	3362444.9
2012	3247908.8
2013	3197901.6
2014	3537174.5
2015	3321749
2016	3387536.1
2017	3401737.5
2018	3688380.3
2019	3386688.2
2020	3327567
2021	3417986.8
2022	3172399.7