Year	PPG (TDS, current US$)
1970	4431000
1971	5006000
1972	4481000
1973	6558000
1974	7015493.7
1975	8730946
1976	11907759.6
1977	23417450.3
1978	23249528.1
1979	17141675.5
1980	25344906
1981	25298316
1982	19254759.1
1983	17805213.6
1984	20816789.7
1985	22107278.2
1986	18806014.5
1987	27516414.5
1988	28088442
1989	29776226.6
1990	17151460.7
1991	17207423.4
1992	3574832.2
1993	3135204.4
1994	3114456.8
1995	66177438.2
1996	25201970.3
1997	33053404.2
1998	32689898.1
1999	35874526.8
2000	34120223.8
2001	22930052.8
2002	16331510.3
2003	37374998.4
2004	90223359.8
2005	50934911.7
2006	50780984.6
2007	45544719.5
2008	57540278.8
2009	41031847.9
2010	130458632
2011	5086674
2012	5312000
2013	12794254.8
2014	24020420
2015	34916890.8
2016	86330539.2
2017	10401570
2018	8435648
2019	9570000
2020	9744000
2021	14906889.2
2022	30224000