Year	TDS, current US$
1970	2118275.8
1971	2096983.6
1972	3269202.4
1973	3808626.7
1974	3769790.4
1975	5235909.1
1976	4680948.5
1977	5480935.4
1978	7179328.8
1979	9204558.8
1980	22162354
1981	19636619.8
1982	19773184.5
1983	18049224.9
1984	21628084
1985	29459096.3
1986	36784112
1987	36125963.4
1988	42713339.1
1989	38551432.3
1990	34300368.5
1991	46388864.4
1992	33430338.8
1993	37969383.9
1994	43584707.1
1995	48444528
1996	48535927.7
1997	51432489.8
1998	54157938
1999	64955743.5
2000	47481195
2001	38370318.5
2002	44451440.8
2003	47162210.8
2004	52801760.2
2005	46365486
2006	45474019.1
2007	115878774.5
2008	203546335.7
2009	311442010.3
2010	442793610.3
2011	614217747.3
2012	800565636.3
2013	1026861732.9
2014	1254419045.6
2015	1607980479.4
2016	1235351503.3
2017	1582534335.8
2018	2999515694.4
2019	2314763397.4
2020	2166761439.4
2021	496020328.8
2022	544164125