Year	TDS, current US$
1975	36000
1976	60000
1977	60000
1978	66000
1979	162000
1980	276000
1981	508000
1982	637000
1983	679000
1984	1284568.4
1985	1752669.2
1986	2074853.6
1987	2593108.7
1988	3143530.6
1989	1824178.4
1990	2107380.6
1991	2575690.3
1992	3077164.2
1993	5064346.1
1994	4301911.4
1995	4185017.7
1996	3858343.2
1997	3772446.7
1998	4455148.5
1999	4652986.7
2000	4266857.9
2001	4748443.4
2002	5495714.7
2003	5379160.5
2004	5430937.6
2005	6379855.4
2006	8196539.9
2007	9430726.4
2008	11563279.8
2009	12099053.7
2010	11242627.4
2011	12247784.2
2012	8982520.9
2013	14806227.1
2014	13667550.7
2015	14551586.1
2016	16200054.2
2017	17570501.8
2018	18440870
2019	19135693.2
2020	18089341.5
2021	20332895.4
2022	19946231.8