Year	PPG (TDS, current US$)
1981	607642.3
1982	917781.1
1983	539109.2
1984	1318808.4
1985	1864623
1986	2784092
1987	3249391.8
1988	3747714.7
1989	4392936
1990	4492210.3
1991	4927051
1992	5068095.3
1993	6608138.8
1994	6766951.1
1995	5765497.1
1996	5282798
1997	9481089.6
1998	9951852.2
1999	10037101.7
2000	9912633.7
2001	16775387.5
2002	12193405.7
2003	14447374.2
2004	15875407.6
2005	15392587
2006	17267181.8
2007	16554659.2
2008	18369520.5
2009	20419924.9
2010	15234995.3
2011	14753235.7
2012	16806736.4
2013	16884715.8
2014	18740417.5
2015	21149889.1
2016	25347652.7
2017	27504494
2018	32142075.7
2019	25060619.7
2020	25634977.2
2021	17017284
2022	27488945