Year	TDS, current US$
1970	533583018.5
1971	681536706.5
1972	910100749.7
1973	1138522678.8
1974	1290667085.1
1975	1462645784.3
1976	1493046614.3
1977	1805096427.5
1978	2099556793
1979	3315451138.7
1980	3738607281.9
1981	3728345557.3
1982	4078427375.1
1983	3649670292.6
1984	4494843596.7
1985	3367679950.6
1986	4014715392.9
1987	3735902974.1
1988	3746884984.8
1989	3808370477.7
1990	4779142951.9
1991	3833659679.6
1992	1899487821.3
1993	56280790.2
1994	46877725.3
1995	46917000
1996	18556331.6
1997	52694769.6
1998	65154672.6
1999	44878282.3
2000	123677694.2
2001	107546349.8
2002	237669847
2003	409765473.7
2004	900445001.3
2005	1234478089.5
2006	2151354556.8
2007	3235099732.1
2008	4735414862.5
2009	4646024231.7
2010	4306782758.3
2011	5209732020.9
2012	6038931669.7
2013	8437065527.8
2014	8293647054.6
2015	4184735145.9
2016	5868649188.5
2017	4866779844.6
2018	5548452827.2
2019	6876574815.3
2020	5010742540.3
2021	5653878692.7
2022	5713988698.6