National Trends in Lead Concentrations in 1990 - 2008

Year	Mean	Number of Trend Sites	10th Percentile	90th Percentile
1990	0.87609375	64	0.03	2.41
1991	0.75609375	64	0.04	1.93
1992	0.7328125	64	0.03	1.76
1993	0.9396875	64	0.02	1.05
1994	0.75046875	64	0.02	1.37
1995	0.56234374999999	64	0.02	1.74
1996	0.5925	64	0.02	1.22
1997	0.37046875	64	0.02	0.99
1998	0.2453125	64	0.02	0.78
1999	0.30890624999999	64	0.02	1.02
2000	0.29812499999999	64	0.02	1.08
2001	0.398125	64	0.01	1.26
2002	0.19171874999999	64	0.01	0.84
2003	0.19578124999999	64	0.01	0.69
2004	0.23515624999999	64	0.01	0.9
2005	0.16984374999999	64	0.01	0.41
2006	0.14203125	64	0.01	0.39
2007	0.17374999999999	64	0.01	0.52
2008	0.19406249999999	64	0.01	0.51