Year	TDS, current US$
1971	1000
1972	2000
1973	2000
1974	28000
1975	89355.9
1976	148697.3
1977	314980.1
1978	304561.3
1979	367244.5
1980	1041683.8
1981	1172456
1982	1590796.7
1983	2682391
1984	4404759
1985	4655669.5
1986	5323843
1987	7240264.8
1988	6602184.2
1989	10680753.1
1990	9105043.9
1991	10568225
1992	9996675.7
1993	14650218.7
1994	3208680.7
1995	19496234.3
1996	13475573.9
1997	15448590.7
1998	12879822.4
1999	17370693.3
2000	18271062
2001	10805826.3
2002	8132639.9
2003	9803838.3
2004	13938528.7
2005	17496194.4
2006	19479747.2
2007	16296976.3
2008	12612148.7
2009	9134471.9
2010	11301648
2011	14264975
2012	15912760.6
2013	17681848.4
2014	19673804
2015	22720162.3
2016	23939320.1
2017	31331320.5
2018	37170755.8
2019	41749286.2
2020	51084100.2
2021	68058547.8
2022	82388356.1