Year	PPG (TDS, current US$)
1970	30088546.9
1971	30037484.5
1972	26521417.2
1973	33110768.9
1974	37394830.4
1975	43056265.7
1976	54710899.8
1977	63627416.4
1978	131871884.6
1979	137243055.9
1980	231759747.7
1981	272034138.7
1982	307788101.7
1983	291422436.6
1984	305554408.9
1985	344752149.2
1986	358486383
1987	417878291.2
1988	452459339.5
1989	428102745
1990	507290736.9
1991	521822689
1992	412636565.5
1993	409351273.6
1994	711820874.9
1995	700829528
1996	643286912.2
1997	477234513.2
1998	489407104.6
1999	509883497.8
2000	442873123.8
2001	354841555.8
2002	424535775.5
2003	510401641.9
2004	303852672.9
2005	502667743.8
2006	391883766.2
2007	414815731.3
2008	380337609.6
2009	344869057.5
2010	350347030.2
2011	386713866.2
2012	475629146.6
2013	451065670.6
2014	1230227045.9
2015	679900284.7
2016	771070054.6
2017	1173951605.6
2018	2311875045.7
2019	3980770215.6
2020	2460375119.5
2021	2081427499.8
2022	2960838459.5