Year	PPG (TDS, current US$)
1970	2084489628.4
1971	2268889662.3000007
1972	2677008752.8
1973	3761992613.7000003
1974	4524733696.400001
1975	5491866558.099999
1976	6686821533.7
1977	9525176544.800001
1978	15697750466.800001
1979	22063211033.3
1980	22097663728.9
1981	25060075395.399998
1982	27291303712.199997
1983	25738380191.2
1984	26417897352.7
1985	27460331016.500004
1986	26466700523.300003
1987	26638823427.100002
1988	32603495163.199997
1989	27755073956.3
1990	24960350686.1
1991	26229817084.699997
1992	32309368716.200005
1993	28451132221.000008
1994	32344685950.600002
1995	42937098092.9
1996	56604247781.5
1997	61917668044.2
1998	53883187120
1999	61088445244.9
2000	67849336499.5
2001	61382654383.99999
2002	58334248446.600006
2003	63014985538.00001
2004	61118848080.29999
2005	59695425632.4
2006	89425132495.79999
2007	67588012691.7
2008	65903343315.799995
2009	58548089556.899994
2010	58375500687.00001
2011	62769419464.19998
2012	69880214411.1
2013	67060506373.000015
2014	60115711053.4
2015	85226673597
2016	101883443942.99998
2017	123783247201.59999
2018	118178901054.59999
2019	140462190141.79996
2020	109053986072.00002
2021	114888139791.5
2022	90789314902.39998