Year	TDS, current US$
1975	32000
1976	32000
1977	98000
1978	145000
1979	482000
1980	1011000
1981	1664306.2
1982	2148704.7
1983	2550868.8
1984	1780192.9
1985	4297960
1986	3400686.1
1987	3595881.6
1988	4422874.1
1989	5312384.9
1990	5423691.8
1991	6597316.3
1992	6904249.5
1993	7394891.3
1994	8077515.9
1995	11186812.4
1996	11066052.8
1997	10312177.3
1998	11380014.3
1999	13598048.8
2000	16188484.9
2001	17671622.5
2002	17336634.8
2003	21457478.4
2004	23517004
2005	24213690.1
2006	26386448.7
2007	33573670.2
2008	32542434.9
2009	24706808
2010	25515819.1
2011	23730567.4
2012	24379141.5
2013	27019848.3
2014	28770963.6
2015	30425657.8
2016	33991738.7
2017	37601544
2018	39987244.8
2019	45337673
2020	42373882.7
2021	46329156.3
2022	51610498.5