Year	PPG (TDS, current US$)
1970	485775621.99999994
1971	543452985.6000001
1972	654064152.1999999
1973	1131030540.8999999
1974	1026841144.6
1975	1272923420.4000003
1976	1311906932.3000002
1977	1722142868.2000005
1978	1956979485.3000007
1979	2450266634.6000004
1980	3252053778.9000015
1981	3390975643.7999997
1982	3165915455.1000004
1983	2885391590.9
1984	3036152118
1985	3298779102.7
1986	4149044062.6999993
1987	4186226787.0999985
1988	4309289377.8
1989	3987632239.0999994
1990	4125928886.1000004
1991	4840601371.1
1992	3888226482.3
1993	4008649421.3999996
1994	4565522883.699999
1995	5559669309.3
1996	5363840065.900001
1997	4913876452.800001
1998	5172520099
1999	5120499635.700002
2000	4740014606.8
2001	3821496725.5
2002	4209700333.0999994
2003	4313668235
2004	4271354568.499999
2005	4139206646.9999995
2006	4461687241
2007	5710250579.599998
2008	6785911818.199998
2009	7259298177.799997
2010	6970925236.8
2011	7617343116.700005
2012	8965421213.000002
2013	11383326947.800003
2014	12961867281.900002
2015	12113380298.5
2016	13799593505.000002
2017	17108449448.000002
2018	20492548504.699997
2019	24877003046.7
2020	23337438001.599995
2021	27759942630.399994
2022	24060947622.7