Year	TDS, current US$
1981	151991.5
1982	350678.5
1983	1195366.4
1984	1821449.5
1985	1941242.7
1986	1600145
1987	4753667.9
1988	5189392.8
1989	4248774.5
1990	3668488.1
1991	6158838.4
1992	7028153.3
1993	5277766.8
1994	8138379.1
1995	8119415
1996	6912617.9
1997	9252809.6
1998	8763171.9
1999	7786677.9
2000	9119018.6
2001	6987427.6
2002	12174640.9
2003	10000369
2004	11548708.7
2005	16660744.1
2006	13020705.9
2007	13953341.8
2008	15309587.8
2009	17855499.6
2010	20157598.7
2011	21084119.8
2012	22047572.3
2013	23521258.1
2014	25344176.3
2015	23920170.6
2016	25680228
2017	31164540.2
2018	34100421.9
2019	38632941.6
2020	42389083.8
2021	45571670.3
2022	42994902