Year	PPG (TDS, current US$)
1970	3612040.6
1971	9483351.5
1972	9314889.2
1973	11017458.2
1974	11909594.5
1975	10836620.8
1976	8222086.1
1977	8030942.8
1978	7683379.5
1979	9628863.8
1980	13387476
1981	53822240.2
1982	72129152.8
1983	64948963.7
1984	75942185.3
1985	88610662.2
1986	69531811.2
1987	66052257.2
1988	51788451.6
1989	39820050.5
1990	38746701.4
1991	47572157
1992	65060006.5
1993	68361639.3
1994	122137236.8
1995	158389915.4
1996	217344615.3
1997	607885057.8
1998	266029287.8
1999	425571328.3
2000	1251737105.5
2001	1194936764.8
2002	1766481440.1
2003	2958876284
2004	4067640036.4
2005	3103612767.5
2006	4042751206.2
2007	4185196068.3
2008	4259690351.1
2009	4538983531.4
2010	3882926911.3
2011	5216126183.2
2012	3808900730
2013	3400913990.2
2014	3947988747.5
2015	3909992034.1
2016	4345413077.4
2017	4791317549.9
2018	4739509625.7
2019	5058854551.3
2020	353134696.8
2021	249458387.2
2022	143306905.2