Year	PPG (TDS, current US$)
1970	126900
1971	192731.4
1972	273692.6
1973	329233.9
1974	417246.4
1975	420482.8
1976	365117.3
1977	638446.9
1978	414138.5
1979	496739.1
1980	772537.4
1981	2623480.7
1982	10516532.2
1983	6672141.2
1984	4711255.5
1985	891663.6
1986	8235757.6
1987	13462727.3
1988	14023771.6
1989	16435739.1
1990	30310269.9
1991	23309738.8
1992	25360509.6
1993	24432687.1
1994	25404776.9
1995	20744053.2
1996	19336981.6
1997	19144371.2
1998	19978866.8
1999	16523660
2000	18660224.5
2001	13076753.3
2002	14196244
2003	19916281.2
2004	25304980.1
2005	25344783.5
2006	24900533.7
2007	28892698.7
2008	16031503.1
2009	18972940.8
2010	24434915.8
2011	27075904.9
2012	26522068.8
2013	28801357.8
2014	45236316.5
2015	35261888.8
2016	35054929.1
2017	32518399.3
2018	38335232.7
2019	37764758.5
2020	30424408.7
2021	33660441.5
2022	31431145.6