Year	TDS, current US$
1971	3490000
1972	1899794
1973	1080892.5
1974	818499
1975	829789
1976	5374083.2
1977	8559520
1978	4254755.8
1979	6000166.5
1980	3470075.5
1981	7350414.5
1982	3857168
1983	4646139.1
1984	7691196.2
1985	19204182.3
1986	29315367.6
1987	33536297.5
1988	29824075.2
1989	22694337.2
1990	14907055.5
1991	6545673.5
1994	4241.2
1995	37466228.1
1996	3683625.3
1997	2336050.3
1998	6464367.3
1999	13287252.2
2000	7656910
2001	1476876.7
2002	10231960.3
2003	15209116.1
2004	7727796.9
2005	5632647.2
2006	6494475.2
2007	34629615.1
2008	476084.9
2009	3969289.2
2010	809051.8
2011	133984.7
2012	36914.9
2013	155016.9
2014	59908.6
2015	55332.8
2016	3523827.5
2017	5914677.5
2018	9655857.2
2019	11739755.6
2020	15784121.4
2021	10380626.7
2022	16285994.7