Year	PPG (TDS, current US$)
1970	82000
1971	55192.7
1972	42679.4
1973	56634.9
1974	56133.1
1975	56010.6
1976	74961.3
1977	110432.4
1978	134245.1
1979	226255.2
1980	422055.8
1981	621053.7
1982	1401532.6
1983	1394309.5
1984	1917986.3
1985	2433885.7
1986	2707033.3
1987	2907902.3
1988	3466130.9
1989	3531062.9
1990	4229039.3
1991	4822998.5
1992	5904670.4
1993	7717043.8
1994	7267345.4
1995	7150878.3
1996	8402613.5
1997	9893979
1998	10013286.4
1999	12571151.4
2000	11215940.6
2001	11979783.8
2002	11816296.4
2003	13768803.3
2004	19311572.1
2005	23637119.5
2006	33320195.7
2007	27777151.7
2008	30707524.1
2009	36108139.5
2010	36233746.7
2011	35077988.2
2012	36593170.2
2013	32626415.4
2014	29831299.8
2015	32465567.9
2016	30633319.5
2017	32573977.9
2018	37389650.5
2019	36118104.9
2020	31675274.1
2021	29799253.4
2022	35248101.8