Year	TDS, current US$
1970	4561000
1971	5431545.9
1972	5066368.9
1973	6294425.9
1974	6679306.2
1975	3187272.9
1976	3360212.6
1977	3570246.9
1978	3671476.8
1979	4048678.5
1980	4274159.3
1981	5049273.1
1982	6306351.6
1983	6533170.6
1984	8215303.6
1985	8591213.7
1986	14203480.9
1987	19894837.5
1988	24945964
1989	26438343
1990	33761345.7
1991	38950821.1
1992	41024651.6
1993	31362299.7
1994	73558893.7
1995	68288346.1
1996	89489774.4
1997	85760363.7
1998	43432483.4
1999	58362455.3
2000	86327595.2
2001	73767654
2002	44977947.8
2003	109201729
2004	88574715.8
2005	75481582.4
2006	76768337.5
2007	72428884.2
2008	72223066.3
2009	78859126.8
2010	77594879
2011	68501888.9
2012	61619147.6
2013	67129575.7
2014	65329372.7
2015	53787754
2016	38154265.6
2017	83852029.7
2018	71023995.8
2019	167106230.9
2020	230864758.2
2021	104694922.1
2022	157608758.5