Year	PPG (TDS, current US$)
1970	26219185.8
1971	34803068.3
1972	35717153.2
1973	72916393.9
1974	54232080.6
1975	60167153
1976	80990361.2
1977	105872517.2
1978	103535331.5
1979	62648728.6
1980	93394016.4
1981	168948992.5
1982	171581761.3
1983	89638663.6
1984	68810833
1985	60805503.2
1986	40319336.9
1987	71528455.9
1988	32857000
1989	16741000
1990	13919000
1991	540689084.6
1992	84373664.2
1993	122992240.4
1994	198109995.5
1995	267595793.5
1996	197734889.2
1997	313816986.9
1998	178075385.9
1999	137725961.7
2000	149840994
2001	125388326.2
2002	103326772.2
2003	123579785.6
2004	66278236.4
2005	107810322.3
2006	97901808
2007	243838084.9
2008	91456556.9
2009	99487476.9
2010	89346848.4
2011	102746525.6
2012	91912571.4
2013	97779044.8
2014	118913507.3
2015	132736878.2
2016	163293922.7
2017	205334848
2018	228791175.1
2019	295389213.7
2020	347166776.4
2021	368977830.1
2022	428351815.9