Year	PPG (TDS, current US$)
1971	366733.7
1972	326000
1973	4835605.8
1974	4143955.1
1975	4390500
1976	14298356.3
1977	10765021.9
1978	12864255.9
1979	18664501.3
1980	34809965.5
1981	76606853.7
1982	71502974
1983	58662716.2
1984	82237105.3
1985	94479070.2
1986	128534779.7
1987	216021101.4
1988	254850244.5
1989	207199288
1990	107873864.2
1991	151055403.8
1992	102996836.9
1993	98654077.6
1994	80892386.1
1995	90686043.4
1996	78938474.8
1997	86135382.5
1998	189294258.9
1999	121973254.8
2000	126480412.1
2001	180636545.7
2002	140143088.1
2003	151216031.8
2004	175950885.6
2005	148944062.7
2006	167709689.5
2007	178090064.2
2008	204172425
2009	212101469.9
2010	228721180.2
2011	249792824.9
2012	254716749.3
2013	269251760.4
2014	361087453.8
2015	356037900.4
2016	128845570.1
2017	78892000
2018	83895000
2019	84041000
2020	86051000
2021	91361000
2022	87817000