Year	PPG (TDS, current US$)
1970	6420079.9
1971	7927251.6
1972	8942241.3
1973	11381236.9
1974	14970310.5
1975	17561895.4
1976	18336728
1977	22913301.9
1978	37768409.2
1979	44962503.7
1980	68008972.3
1981	88861794.7
1982	63812168.8
1983	54257864.5
1984	69018731.6
1985	76373024.8
1986	102238432.1
1987	66138097.2
1988	57180115.6
1989	56728422.8
1990	101461261.8
1991	100353123.5
1992	80746538.3
1993	70890350.2
1994	72819476.2
1995	104187691.6
1996	68172894.7
1997	63991845.4
1998	59166028.7
1999	48511601.6
2000	50605052.5
2001	40402610.4
2002	27803916.7
2003	32607108
2004	49097833
2005	59553463
2006	49656930.9
2007	31180398.3
2008	31588576.4
2009	37254830.4
2010	19745711.8
2011	21256293.2
2012	24161756.8
2013	35385565.7
2014	41932310.3
2015	45942285.9
2016	49835973.2
2017	48273769.2
2018	54466089.2
2019	79013199.9
2020	72609782.7
2021	81663840.2
2022	101365010.2