National Trends in Lead Concentrations in 1990 - 2012
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1990 1.1890909090909 33 0.06 2.41
1991 1.13818181818181 33 0.05 2.41
1992 1.1560606060606 33 0.04 3.17
1993 1.61363636363636 33 0.04 2.16
1994 1.2090909090909 33 0.04 2.35
1995 0.88545454545454 33 0.03 2.13
1996 0.92939393939393 33 0.03 2.28
1997 0.5460606060606 33 0.03 1.17
1998 0.32575757575757 33 0.03 0.92
1999 0.4160606060606 33 0.02 1.18
2000 0.40797979797979 33 0.02 1.23
2001 0.44656565656565 33 0.02 1.25666666666666
2002 0.2430303030303 33 0.02 0.98
2003 0.23818181818181 33 0.02 0.85
2004 0.24484848484848 33 0.02 0.9
2005 0.19621212121212 33 0.02 0.4
2006 0.16121212121212 33 0.01 0.43
2007 0.19939393939393 33 0.01 0.73
2008 0.23818181818181 33 0.01 0.52
2009 0.1480303030303 33 0.01 0.36
2010 0.13454545454545 33 0.01 0.44
2011 0.18030303030303 33 0.01 0.88
2012 0.14969696969696 33 0.01 0.36