Year	PPG (TDS, current US$)
1970	867721.6
1971	1151798.8
1972	1925415.1
1973	2597480
1974	3057490.3
1975	3445763.4
1976	2480466.9
1977	3281650.8
1978	4149260.1
1979	4014542.8
1980	8967771
1981	45941445.9
1982	11242140.9
1983	16900926
1984	8286670.5
1985	5011789.3
1986	6808015
1987	7662464.9
1988	3957774.2
1989	17228090
1990	6716272.4
1991	41056.4
1996	2787427.2
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	480864257.1
2021	16637916.8
2022	15374061.4