National Trends in Lead Concentrations in 1980 - 2010
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1980 1.33838709677419 31 0.31 3.02
1981 1.43193548387096 31 0.31 3.02
1982 1.32032258064516 31 0.31 3.02
1983 1.30129032258064 31 0.33 2.94
1984 1.15612903225806 31 0.28 2.51
1985 1.14354838709677 31 0.21 3.15
1986 0.75838709677419 31 0.09 2.17
1987 0.75129032258064 31 0.07 2.39
1988 0.95838709677419 31 0.05 1.85
1989 0.56290322580645 31 0.05 1.88
1990 0.52516129032258 31 0.05 1.54
1991 0.46129032258064 31 0.03 1.38
1992 0.36999999999999 31 0.03 1.1
1993 0.33258064516129 31 0.03 1.01
1994 0.44 31 0.03 1.37
1995 0.35677419354838 31 0.03 1.65
1996 0.39387096774193 31 0.02 1.22
1997 0.28903225806451 31 0.02 0.99
1998 0.2616129032258 31 0.03 0.78
1999 0.27451612903225 31 0.02 1.09
2000 0.26967741935483 31 0.02 0.88
2001 0.47096774193548 31 0.02 0.81
2002 0.21612903225806 31 0.02 0.84
2003 0.18548387096774 31 0.01 0.64
2004 0.26838709677419 31 0.01 0.93
2005 0.19354838709677 31 0.01 0.41
2006 0.17419354838709 31 0.01 0.61
2007 0.21096774193548 31 0.01 0.72
2008 0.25322580645161 31 0.01 0.81
2009 0.22645161290322 31 0.01 0.4
2010 0.14387096774193 31 0.01 0.42