National Trends in Lead Concentrations in 1980 - 2012
Year Mean Number of Trend Sites 10th Percentile 90th Percentile
1980 1.48076923076923 13 0.36 2.64
1981 1.16 13 0.36 2.02
1982 0.99038461538461 13 0.4 1.92
1983 1.00153846153846 13 0.45 2.39
1984 0.97153846153846 13 0.45 2.38
1985 1.10615384615384 13 0.28 2.81
1986 0.63923076923076 13 0.16 1.96
1987 0.83730769230769 13 0.1 2.7
1988 1.0576923076923 13 0.07 1.57
1989 0.53538461538461 13 0.06 1.62
1990 0.36846153846153 13 0.06 1.07
1991 0.34153846153846 13 0.05 1.31
1992 0.2976923076923 13 0.04 1.1
1993 0.25692307692307 13 0.04 0.85
1994 0.38538461538461 13 0.04 1.13
1995 0.26846153846153 13 0.03 0.68
1996 0.24615384615384 13 0.03 1
1997 0.21384615384615 13 0.03 0.84
1998 0.21230769230769 13 0.03 0.78
1999 0.23230769230769 13 0.03 0.92
2000 0.22 13 0.02 0.88
2001 0.26461538461538 13 0.02 0.81
2002 0.19230769230769 13 0.02 0.65
2003 0.15692307692307 13 0.02 0.41
2004 0.24923076923076 13 0.01 0.93
2005 0.23692307692307 13 0.01 0.4
2006 0.15 13 0.01 0.36
2007 0.15230769230769 13 0.01 0.36
2008 0.2676923076923 13 0.01 0.37
2009 0.12346153846153 13 0.01 0.285
2010 0.10230769230769 13 0.01 0.2
2011 0.12307692307692 13 0.01 0.18
2012 0.13153846153846 13 0.01 0.3