Year	TDS, current US$
1971	23000
1972	151000
1973	334000
1974	722000
1975	1097000
1976	2024000
1977	2681000
1978	5713367
1979	3698854.6
1980	4372451.5
1981	6525010.1
1982	9591668.9
1983	13064341
1984	16462774.6
1985	19466664.9
1986	22863161.5
1987	25972180.6
1988	29154417.5
1989	28750881.8
1990	48754671.4
1991	35055173.6
1992	38336552.3
1993	41141335.8
1994	51170776
1995	37670965.8
1996	24843082.9
1997	16077285.4
1998	17595290.1
1999	25041053
2000	19986021.8
2001	13706758.5
2002	13768949.7
2003	13005494
2004	8487545
2005	9702025.9
2006	10115252.3
2007	13245079.7
2008	10072944.3
2009	9502428.6
2010	8836012.4
2011	12240251.9
2012	8613000
2013	10701474.8
2014	12216000
2015	9737000
2016	10606000
2017	11017908.1
2018	13154725
2019	26244360.3
2020	16470957.1
2021	20119777
2022	35852000