Year	TDS, current US$
1981	1174761.7
1982	1227892
1983	1335616.6
1984	1245310.5
1985	1463626.3
1986	1899678.6
1987	2617115.4
1988	3521456.7
1989	5321399.1
1990	6345579.6
1991	10265620.1
1992	11607882.4
1993	11205936.3
1994	10845381.6
1995	11872244
1996	12785155.6
1997	13530818.1
1998	16333517.1
1999	18283547.8
2000	30176627.8
2001	25273632.6
2002	20350055.9
2003	30119537.4
2004	23738823.5
2005	32103026.9
2006	34608499.2
2007	47537103.7
2008	58656977.3
2009	43136088.2
2010	44194608.1
2011	44821986.7
2012	44234892.3
2013	36092467.8
2014	36877762.8
2015	70127033.6
2016	48439894.1
2017	47748666.1
2018	50099726.7
2019	51541219.2
2020	44765540.6
2021	45284464.7
2022	51536916.1