Year	TDS, current US$
1970	598072786.8
1971	669287622.3000001
1972	789401100.1999999
1973	1255631620.5
1974	1165737467
1975	1507605890.8000004
1976	1723956177.1000004
1977	2081855907.5000005
1978	2518316658.5999994
1979	3213979497.6000004
1980	5182851814.099999
1981	5511858047.6
1982	5111968212.1
1983	4587840837.700001
1984	4910672695.000001
1985	5279221072.8
1986	6689950521.299997
1987	6950930437.0999975
1988	6841850665.4000025
1989	6535535828.6
1990	6619907632.1
1991	6706826004.200001
1992	5367017590.3
1993	5300334776.400001
1994	5940522968.4
1995	9007270113.999998
1996	6969192495.9
1997	6719633355.200001
1998	7073822485.299997
1999	7084915815.3
2000	6738282493.600001
2001	5939285162.3
2002	6555824393.299998
2003	6389023845.999999
2004	6494603453.299998
2005	6195400091.699999
2006	6682260107.999999
2007	8855012619
2008	10859718262.2
2009	11049104794.4
2010	10997210768.599997
2011	12915291051.900002
2012	16230399618.700006
2013	19503249323.69999
2014	25751536467.899994
2015	21892541425.700005
2016	27111049583.199997
2017	32362874280.100014
2018	37738062459.299995
2019	49178007444.2
2020	36916208584.200005
2021	50333519330.00001
2022	47258811359.49999