Year	TDS, current US$
1973	999.8
1974	3045.2
1975	9138.1
1976	30638.8
1977	66109.9
1978	93874.8
1979	172921.9
1980	363537.4
1981	380927.6
1982	633270.5
1983	700414.4
1984	1567311
1985	2127636.5
1986	2281299.7
1987	2363752.9
1988	2845868.5
1989	3093451.2
1990	3735712
1991	4285340.7
1992	4918103.5
1993	6678163.3
1994	5236913.2
1995	5065824.1
1996	5948794
1997	5261031.7
1998	6356509
1999	5751867.7
2000	5765312.5
2001	5973526.3
2002	6203456.3
2003	7149555.3
2004	7730111.5
2005	7372073.1
2006	7529087.7
2007	7161490.2
2008	10469936.5
2009	16053598.4
2010	16525420.9
2011	17182349.5
2012	18632399.7
2013	19233314.8
2014	17815864.7
2015	23060885.5
2016	23616117
2017	25053432.5
2018	27384329.1
2019	27306452.5
2020	22174199
2021	23523041.6
2022	27223368.5