Year	TDS, current US$
1972	1086000
1975	1130000
1976	2140000
1977	2738173
1978	9256300.2
1979	20824196
1980	12512221.9
1981	8768715.7
1982	4100174.5
1983	3588876.1
1984	4364432.1
1985	8692193.2
1986	21602619.3
1987	21665815.3
1988	8435058.9
1989	4171400.3
1990	1200156
1991	151908.7
1996	2581273.8
1997	6779995.5
1999	44754045.6
2000	82992383.2
2001	59629066.9
2002	21806089.6
2003	22456706
2004	45340830.6
2005	60070971.2
2006	64668463.6
2007	90291602.9
2008	72840671.3
2009	44998699
2010	28235962.7
2011	25225834.3
2012	106722.6
2013	458840.3
2014	176277.3
2015	162298.5
2016	9944478.7
2017	18263345.5
2018	27404430.7
2019	29623289.6
2020	48041314
2021	31762118.3
2022	25630222.6