Year	PPG (TDS, current US$)
1970	709813.2
1971	803700.4
1972	973977.4
1973	5064987.9
1974	2594165.5
1975	3227422.2
1976	4011415.7
1977	6939752.9
1978	6950583.9
1979	7952674.2
1980	9382405.9
1981	9478646.7
1982	11508170.9
1983	13867347
1984	18060883.1
1985	34435768.9
1986	29688388.3
1987	32103309
1988	45307925.5
1989	38765298.1
1990	42859485.1
1991	30411887.4
1992	47707103.2
1993	66748549.9
1994	77120008
1995	77497602.5
1996	105981582.9
1997	62486914.6
1998	62133916.2
1999	85084595
2000	67500722.6
2001	62263025.5
2002	59872613.5
2003	54670481.3
2004	77760352.8
2005	78511199.9
2006	81355333.3
2007	62099534.7
2008	68797981.4
2009	67653681.3
2010	68108848.4
2011	68029343.6
2012	58246518.6
2013	105261267.8
2014	100559714
2015	104701040.1
2016	120277912.7
2017	144884446
2018	160969531.4
2019	188327159.5
2020	232557916.4
2021	269857004.2
2022	287913213.4