Year	TDS, current US$
1970	41000
1971	236282.1
1972	388461.1
1973	461043.6
1974	565577.8
1975	740493.3
1976	1197220.6
1977	1364689.5
1978	2791063
1979	3771774.1
1980	4702165.2
1981	9294427.3
1982	10415070.5
1983	17084486.6
1984	17296127.2
1985	15344545.7
1986	26985181.3
1987	28626736.2
1988	33066391
1989	33831647.2
1990	38828319.9
1991	40460748.4
1992	41870405.3
1993	41538919.1
1994	47736496.2
1995	53500604.5
1996	45276980.8
1997	41571298.2
1998	48361356.3
1999	44624155.3
2000	47332756.2
2001	27364004.4
2002	21940183.4
2003	26939767
2004	38877497
2005	49786335.1
2006	41334801.4
2007	11767779.7
2008	10612899.7
2009	14257220.6
2010	14906394.6
2011	15728634.8
2012	16842814.9
2013	22672756.3
2014	23623528.2
2015	24280359.3
2016	23138648.3
2017	21985611.4
2018	26934259.7
2019	41501492.5
2020	36915676
2021	44950285.2
2022	56673432.7