Year	PPG (TDS, current US$)
1970	3131843.5
1971	2192533.4
1972	1666745.9
1973	4665869
1974	4684322.4
1975	5682062.3
1976	2786138.6
1977	4328792.9
1978	3920778.7
1979	644316.8
1980	1383238.9
1981	3618411.4
1982	4709021.7
1983	17532829.4
1984	14002689.9
1985	11536763.2
1986	15567268.2
1987	17822708.6
1988	12477889.1
1989	16097912.7
1990	16550768.8
1991	9379427.6
1992	11748135.7
1993	5252885.4
1994	15754981.5
1995	6086562.9
1996	5251122.8
1997	6534485.8
1998	18962687.6
1999	11678623.6
2000	11760670.6
2001	12755171.1
2002	340189.8
2003	124123.3
2004	7457328.6
2005	863571.1
2006	63536851.9
2007	62007377.7
2008	18602037.8
2009	11410307.4
2010	3048798.3
2011	1142796.2
2012	4279307
2013	4013013.9
2014	6343865.1
2015	3431511
2016	5827128.1
2017	18431004.7
2018	12338080.1
2019	16737108.9
2020	4121231
2021	6727915.1
2022	7155310.5