Year	PPG (TDS, current US$)
1970	134105
1971	200367.4
1972	258138.5
1973	433944.7
1974	472348.7
1975	857366.8
1976	1420392.9
1977	1571051
1978	1746481.9
1979	2144992.6
1980	3136447
1981	3150744.4
1982	3261904.2
1983	4230618.2
1984	4312909.6
1985	4078199.3
1986	7268409.7
1987	12731288.7
1988	13461658.1
1989	11521419.4
1990	11033071.1
1991	10416040.3
1992	10056233.1
1993	8507183
1994	10724479.3
1995	11143769.1
1996	11525043.7
1997	6577590.3
1998	4768655.7
1999	8239464.1
2000	10581527.5
2001	8136162.8
2002	9945059
2003	14055095.3
2004	17708922.1
2005	14773984.6
2006	21850513
2007	23976270.1
2008	25752712.3
2009	28243220.8
2010	30618399.9
2011	35933286.2
2012	39359616
2013	40066245.1
2014	35931814.2
2015	42664465.1
2016	56336465.8
2017	60751910.7
2018	59435533.4
2019	63873217.9
2020	53275162
2021	48502525.4
2022	51889533.1