Year	PPG (TDS, current US$)
1984	678000
1985	808000
1986	1042000
1987	1469000
1988	1517000
1989	1850000
1990	2925000
1991	3416000
1992	3547000
1993	4748000
1994	6590000
1995	6633000
1996	6757000
1997	6748000
1998	10595000
1999	16943000
2000	19501000
2001	21695000
2002	37991000
2003	43314000
2004	46418000
2005	48608000
2006	47319000
2007	47952000
2008	46394000
2009	41727000
2010	44750000