Year	PPG (TDS, current US$)
1978	14517
1979	24850.9
1980	45283.9
1981	101167.4
1982	98179.7
1983	155132.8
1984	1749014.9
1985	2621848
1986	2706895.2
1987	3252851.2
1988	6528360.3
1989	9276198.2
1990	10112887.1
1991	11302205.8
1992	6722012.3
1993	9748977.5
1994	8125872.8
1995	2709571.9
1996	4637489.8
1997	1059200.3
1998	6483154
1999	5730350.1
2000	3569631.6
2001	1748787.9
2002	1462413.9
2003	5325177.9
2004	4798000
2005	7424494.4
2006	4076146.8
2007	11476601.9
2008	15096060.1
2009	8316871.2
2010	10329622.2
2011	8263466.3
2012	8061446.1
2013	7773137.5
2014	7804129.8
2015	6451181
2016	7612567.3
2017	6232841.2
2018	5925675.6
2019	6224830.6
2020	6303142.9
2021	6497200.3
2022	6082582.1