Year	PPG (TDS, current US$)
1970	507700
1971	294865.6
1972	324941.3
1973	399169
1974	284255.7
1975	335029.3
1976	543801.3
1977	457372.4
1978	1088432.6
1979	2406188.1
1980	4824746.7
1981	4419415.2
1982	9326105.9
1983	20972572.1
1984	13464675
1985	17903643.3
1986	13293889.5
1987	13864807.5
1988	22848284.2
1989	21352764.8
1990	22827087.9
1991	26016846.6
1992	33450848.4
1993	32303927.5
1994	27953108.2
1995	37709192.8
1996	34267568.4
1997	43086129.5
1998	46515100.1
1999	48523649.4
2000	56109069.4
2001	64096678.5
2002	64071563.6
2003	64317466.3
2004	52511916.1
2005	78982949.1
2006	44803346.6
2007	95417662.3
2008	32314896
2009	32065251.2
2010	27248847.7
2011	33496883.5
2012	35151191.1
2013	38893855
2014	40923723.1
2015	51588456
2016	54348958.9
2017	49358396.1
2018	58934325.3
2019	61045574.3
2020	59818360.7
2021	296779521.8
2022	282519791.4