Year	PPG (TDS, current US$)
1970	2118275.8
1971	2096983.6
1972	2053218.4
1973	3093171.7
1974	3589389.1
1975	5235909.1
1976	4680948.5
1977	5480935.4
1978	7179328.8
1979	9172257.5
1980	16894671.6
1981	13692966.1
1982	15210241.5
1983	15088284.8
1984	18149356.9
1985	24789918.2
1986	30564310.5
1987	28572811.3
1988	34786654.3
1989	31479686.8
1990	28082026.8
1991	40164592
1992	28691263.2
1993	35865411.2
1994	41694536
1995	46363907.9
1996	45223980.2
1997	46639891.5
1998	47913999.4
1999	55558353.4
2000	38208096.1
2001	28168421.4
2002	33469275.8
2003	42548849.8
2004	48386698.5
2005	41200553.1
2006	43278730.7
2007	37541154.8
2008	41941707.7
2009	43958274.5
2010	48447779.6
2011	64323763.2
2012	65349321.4
2013	73005057.1
2014	88505569.5
2015	98166076.4
2016	106199824.8
2017	115814336
2018	115249181.7
2019	129678753.5
2020	135913486.8
2021	142574575.7
2022	183289676.1