National Trends in Lead Concentrations in 1990 - 2007
| Year |
Mean |
Number of Trend Sites |
10th Percentile |
90th Percentile |
| 1990 |
0.84805555555555 |
72 |
0.03 |
2.41 |
| 1991 |
0.68902777777777 |
72 |
0.03 |
1.88 |
| 1992 |
0.65194444444444 |
72 |
0.03 |
1.1 |
| 1993 |
0.85069444444444 |
72 |
0.02 |
1.01 |
| 1994 |
0.68305555555555 |
72 |
0.02 |
1.35 |
| 1995 |
0.51805555555555 |
72 |
0.01 |
0.77 |
| 1996 |
0.55499999999999 |
72 |
0.01 |
1 |
| 1997 |
0.34986111111111 |
72 |
0.01 |
0.84 |
| 1998 |
0.23541666666666 |
72 |
0.02 |
0.69 |
| 1999 |
0.28777777777777 |
72 |
0.02 |
0.92 |
| 2000 |
0.27972222222222 |
72 |
0.02 |
0.88 |
| 2001 |
0.35861111111111 |
72 |
0.01 |
0.99 |
| 2002 |
0.17499999999999 |
72 |
0.01 |
0.65 |
| 2003 |
0.18430555555555 |
72 |
0.01 |
0.64 |
| 2004 |
0.20541666666666 |
72 |
0.01 |
0.69 |
| 2005 |
0.16416666666666 |
72 |
0.01 |
0.4 |
| 2006 |
0.13861111111111 |
72 |
0.01 |
0.36 |
| 2007 |
0.16930555555555 |
72 |
0.01 |
0.36 |