Year	TDS, current US$
1972	521136
1973	2205986.3
1977	3502.7
1978	4715257.8
1979	1025889.7
1980	3227206.2
1981	11786127.6
1982	21430611.2
1983	18826009.5
1984	31063100.4
1985	28545867.1
1986	38225740.5
1987	43512386.6
1988	37682869.7
1989	33263519.6
1990	25358046.6
1991	25331814.2
1992	21353157.1
1993	6734801
1994	6279594.2
1995	11324660.6
1996	16135138.7
1997	18147875.2
1998	26362186.7
1999	23669065.2
2000	10105312.8
2001	4692291.1
2002	8083972.9
2003	8622633.3
2004	10837431.2
2005	16155780
2006	18830629.2
2007	730919.3
2008	443702.4
2009	864010
2010	340804.4
2011	887711.3
2012	4071152.4
2013	8293469.3
2014	25361135.4
2015	24320983.4
2016	24898728.3
2017	21834197
2018	28984720.4
2019	17334598.5
2020	24948439.8
2021	26417147.6
2022	32440592.4