Year	TDS, current US$
1970	82000
1971	55192.7
1972	42679.4
1973	56634.9
1974	56133.1
1975	56010.6
1976	74961.3
1977	110432.4
1978	134245.1
1979	226255.2
1980	422055.8
1981	691053.7
1982	1511532.6
1983	1494309.5
1984	2617986.3
1985	3331885.7
1986	3297033.3
1987	3093902.3
1988	3696130.9
1989	3761062.9
1990	4391039.3
1991	4981998.5
1992	5991670.4
1993	8437043.8
1994	8659345.4
1995	8639878.3
1996	10077613.5
1997	11521979
1998	11624286.4
1999	14393814.9
2000	13117182.3
2001	11989822.5
2002	11825478.3
2003	13776568.7
2004	19323205.7
2005	23652432.9
2006	33341846.3
2007	27796261.8
2008	30711990.2
2009	36153634.4
2010	36272736.9
2011	35091332.7
2012	36596805.7
2013	32642046.2
2014	30413318.8
2015	33547091.2
2016	32001137.1
2017	34936980.4
2018	40905653.3
2019	38747448.3
2020	33213220.3
2021	31055720.4
2022	36103245.5