Year	PPG (TDS, current US$)
1970	62519.7
1971	58782.8
1972	75376.2
1973	119514.7
1974	156640.9
1975	525249.4
1976	529168.1
1977	362481.3
1978	183904.2
1979	248305.5
1980	303882.5
1981	496487.9
1982	678681.9
1983	1406411.5
1984	2491052.9
1985	1881886.5
1986	1872357.6
1987	1129669.7
1988	534050.7
1989	928968.2
1990	959305
1991	8126105.2
1992	5665708.8
1993	2115296.4
1994	2735307.6
1995	862068.9
1996	1357383.6
1997	2217422.8
1998	2070399.9
1999	2906849.9
2000	2008548.5
2001	1968367.1
2002	4223168.5
2003	2581916.9
2004	3011406.3
2005	3849105.1
2006	3489564.4
2007	25950739
2008	12310401.1
2009	10072429.5
2010	4255323.8
2011	3926713.9
2012	7793000.9
2013	572636.3
2014	776282.1
2015	7056976
2016	4536950.3
2017	1960427.8
2018	2906818.6
2019	2167125
2020	3323516
2021	1589896.3
2022	1664171.7