Year	TDS, current US$
1970	29000
1971	32000
1972	63024.3
1973	84740.1
1974	145133.7
1975	187287.1
1976	234924.6
1977	1010273.9
1978	785578.3
1979	1798118.2
1980	17184347.5
1981	25077572.7
1982	29450811.9
1983	9314257.2
1984	11780681
1985	12961497
1986	17780915.2
1987	21809003.5
1988	23642635.8
1989	15810999.9
1990	12362707.3
1991	11093175.5
1992	10901916.8
1993	43691314.2
1994	20617467.2
1995	13516828.7
1996	12220881.6
1997	25174680.9
1998	16085655.1
1999	16624018.8
2000	17083577.2
2001	16866755.3
2002	12257165.3
2003	19173799.4
2004	22920681.3
2005	24339842.4
2006	33025346.1
2007	15163387.3
2008	15627133.6
2009	26732033.8
2010	16234430.4
2011	24296929.2
2012	28765790
2013	32401411.1
2014	39924767.6
2015	46424024.5
2016	53706325.8
2017	63697582.2
2018	68975396.9
2019	75254036.5
2020	115271268.3
2021	149883752.3
2022	152800132.6