Year	TDS, current US$
1970	6420079.9
1971	7927251.6
1972	9463377.3
1973	13587223.2
1974	14970310.5
1975	17561895.4
1976	18336728
1977	22916804.6
1978	42483667
1979	45988393.4
1980	87436178.5
1981	114447922.3
1982	94242780
1983	80783874
1984	106081832
1985	110018891.9
1986	145964172.6
1987	115750483.8
1988	105497985.3
1989	95790942.4
1990	132638308.4
1991	129684937.7
1992	108066695.4
1993	78225151.2
1994	79599070.4
1995	118036352.2
1996	88416033.4
1997	85074720.6
1998	86592215.4
1999	73725666.8
2000	63563365.3
2001	46082901.5
2002	36896889.6
2003	41946741.3
2004	60490264.2
2005	76169243
2006	70387560.1
2007	33671317.6
2008	32032278.8
2009	38547840.4
2010	20918516.2
2011	22744004.5
2012	28532909.2
2013	43945035
2014	67691445.7
2015	70431269.3
2016	75508701.5
2017	71227966.2
2018	84100809.6
2019	98536798.4
2020	103397222.5
2021	111088987.8
2022	136246602.6