Year	PPG (TDS, current US$)
1970	635280.6
1971	555789.4
1972	1906928.3
1973	857296.5
1974	934315.1
1975	2017139.3
1976	2778841.7
1977	3029558.2
1978	2859292.5
1979	4199390.5
1980	6170308.2
1981	5278400.1
1982	5558152.9
1983	6854209.7
1984	15806523.4
1985	21166641.7
1986	28712881.1
1987	39701962.7
1988	40285899.7
1989	38641612.9
1990	39711078
1991	37522340.8
1992	35646319.5
1993	30883404.6
1994	34148024.2
1995	28749791.3
1996	21595666.6
1997	21153413.5
1998	20936184
1999	20461455.2
2000	13927380.3
2001	16659999.6
2002	18603867
2003	28031461.6
2004	58983490.7
2005	39107738.6
2006	18728233.3
2007	16950619.8
2008	18691266.8
2009	12090253
2010	3860714.7
2011	7159107.9
2012	12920010.2
2013	21397919.4
2014	9638641.6
2015	9411696.8
2016	15275752.7
2017	10646814
2018	12244898.6
2019	20435074.4
2020	14141375.9
2021	18689600.3
2022	25575491.9