Year	PPG (TDS, current US$)
1970	75000
1971	72000
1972	197608.1
1973	699702.6
1974	1117804.4
1975	1060970.5
1976	3328949.5
1977	2115254.4
1978	2876305.7
1979	3724424.7
1980	4566807.3
1981	3416348
1982	2872623.7
1983	3842398.6
1984	4238030.9
1985	5246053
1986	5445055.8
1987	3948167.8
1988	4158479.5
1989	4407934
1990	4449779.4
1991	4118001.5
1992	4556735.8
1993	4060577
1994	5091986.7
1995	4542497.5
1996	4650210.1
1997	4641902.9
1998	4126757.3
1999	4662496.9
2000	5474122
2001	4717313.4
2002	4744081.5
2003	5363142.6
2004	6075495.3
2005	5766598.8
2006	6956489.3
2007	6915208.9
2008	8047625.1
2009	8472306.2
2010	10565098.2
2011	11877140.3
2012	13338249.1
2013	14853913.5
2014	19057452.3
2015	19358656.6
2016	21345317.3
2017	24007348.2
2018	27957461.8
2019	26965836
2020	21879316
2021	13915745.6
2022	33970860.4