Year	TDS, current US$
1970	4399100
1971	4311941.9
1972	8624451.9
1973	9817866
1974	4468025.5
1975	4164317.9
1976	2736821.5
1977	3286986
1978	3843596
1979	7203770.7
1980	17623753.3
1981	20510565.3
1982	21874378.5
1983	23187555.4
1984	21700315.6
1985	26768550.4
1986	34710286.3
1987	50475195.1
1988	37731686.4
1989	32107699
1990	44204122.5
1991	25867571.1
1992	21592644.7
1993	21097033.2
1994	23099306.9
1995	18038637.3
1996	29671334.8
1997	28346170.6
1998	27452689.2
1999	34887864.7
2000	30710800.2
2001	29955633
2002	21578666.3
2003	31919153.2
2004	46707516.3
2005	39015611.8
2006	42466696
2007	53325952.2
2008	60768647.7
2009	55666427.4
2010	54212788.3
2011	50531359.1
2012	59900648.3
2013	113845679.8
2014	226513575.1
2015	96214005.8
2016	40617730.1
2017	130594484.6
2018	55855252.8
2019	54430520.6
2020	103062307.2
2021	65223764.4
2022	131942039.5