Year	TDS, current US$
1972	48293.6
1973	117352.7
1974	305577.5
1975	758857.8
1976	821203
1977	1363589.1
1978	1697887.6
1979	2343488.9
1980	4703568.9
1981	5712062.6
1982	5469862.6
1983	3856761.1
1984	7801028.6
1985	6270536.8
1986	12288544.4
1987	13893530.8
1988	21753987.6
1989	20691347
1990	20527858.9
1991	36981345
1992	22885870.8
1993	29556989.9
1994	36356694
1995	35589011.7
1996	38108572.5
1997	37956495.1
1998	39447240.9
1999	43054963.5
2000	29941774.5
2001	20458991.7
2002	27467712.1
2003	31035496.1
2004	37192127.9
2005	30915501.5
2006	31035345.2
2007	20083697.6
2008	25591898.9
2009	28687908.2
2010	30697935.3
2011	39922456.6
2012	42239915.7
2013	45434192.3
2014	53295514.1
2015	60755198.8
2016	72185111.5
2017	79462875
2018	81575605.2
2019	96507788.4
2020	112431409.1
2021	124869172
2022	144158191.1