National Trends in Lead Concentrations in 1990 - 2010
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1990 0.83951612903225 62 0.04 2.42
1991 0.76129032258064 62 0.04 1.99
1992 0.74322580645161 62 0.03 2.01
1993 1.07016129032258 62 0.03 1.25
1994 0.86709677419354 62 0.02 2.13
1995 0.68919354838709 62 0.03 1.74
1996 0.73338709677419 62 0.02 1.42
1997 0.48838709677419 62 0.02 1
1998 0.41435483870967 62 0.02 0.92
1999 0.39774193548387 62 0.02 1.09
2000 0.3858064516129 62 0.02 0.97
2001 0.52290322580645 62 0.02 1.08
2002 0.24145161290322 62 0.02 0.98
2003 0.22935483870967 62 0.01 0.85
2004 0.29612903225806 62 0.01 0.93
2005 0.2216129032258 62 0.01 0.47
2006 0.19677419354838 62 0.01 0.61
2007 0.21806451612903 62 0.01 0.72
2008 0.2758064516129 62 0.01 0.81
2009 0.16193548387096 62 0.01 0.32
2010 0.13677419354838 62 0.01 0.42