Year	PPG (TDS, current US$)
1970	17492437
1971	16743081.7
1972	16812868.7
1973	17217674.7
1974	19563095.1
1975	32438566.2
1976	21385436.5
1977	26250035.9
1978	26190551.6
1979	74707341.7
1980	37947323.8
1981	25481408.9
1982	32993230.5
1983	19523044.8
1984	19445411.9
1985	18571217.5
1986	28346912.8
1987	12412818.3
1988	19133470.8
1989	2923485.4
1990	1919633.6
1991	16534781.2
1992	96000
1993	21423481
1994	13713667.1
1996	368494.3
1997	49000
1998	38000
1999	27000
2000	0
2001	0
2002	19000
2003	0
2004	0
2005	32501.4
2006	48556.5
2007	641260672.3
2008	106497359.5
2009	16097395.8
2010	4333869.6
2011	2998362.9
2012	4555214.5
2013	6174681.6
2014	14199075.3
2015	5144580.9
2016	4686331.5
2017	9335089
2018	12254848.8
2019	12746471.3
2020	24152765.9
2021	19848496.8
2022	31129523.8