Year	PPG (TDS, current US$)
1970	2399151.4
1971	2181274.1
1972	2349136.9
1973	2615390.4
1974	3086079.8
1975	8109186.4
1976	9174372.7
1977	9143065.9
1978	9293875.4
1979	13090304.2
1980	38921608.4
1981	63005110.8
1982	110955436.3
1983	61479910.4
1984	39751705.2
1985	51792104.9
1986	70456668.5
1987	81269546.7
1988	78002519.4
1989	33114902.2
1990	17442103.1
1991	37690571.9
1992	11998003.6
1993	46460170.5
1994	23369466.5
1995	14152648.7
1996	14474533.5
1997	29675685.9
1998	21447946.5
1999	22115288.8
2000	20122049
2001	19540188.8
2002	14165530.5
2003	22956120.7
2004	24382310.7
2005	26067139.1
2006	46358596
2007	16147922.9
2008	17326113.2
2009	29138927.4
2010	17444497.3
2011	25876538
2012	34042566.2
2013	64773032.5
2014	103094330.5
2015	77328366.9
2016	104195774.9
2017	125463484.5
2018	115586062.5
2019	128576605.4
2020	172602700
2021	192732260.3
2022	253871220.7