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| Read About Estimated Risk | 
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| Year | Months Present | Minimum | Median | Mean | 90th Percentile | Maximum | Standard Deviation | Number of Observations | Detection Limit | Estimated Risk | ||||||||||||
| 2005 | 
 | 0.25 | * | * | * | 0.75 | 0.196 | 5 | 0.05 | * | ||||||||||||
| 2004 | 
 | 0.025 | 0.025 | 0.270 | 0.87 | 2.0 | 0.442 | 30 | 0.05 | 0.09 | ||||||||||||
| 2003 | 
 | 0.025 | 0.06 | 0.430 | 1.2 | 2.6 | 0.665 | 31 | 0.05 | 0.1 | ||||||||||||
| 2002 | 
 | 0.025 | 0.025 | 0.515 | 1.31 | 2.8 | 0.766 | 30 | 0.05 | 0.2 | ||||||||||||
| 2001 | 
 | 0.025 | 0.21 | 0.625 | 1.5 | 4.9 | 1.18 | 31 | 0.05 | 0.2 | ||||||||||||
| 2000 | 
 | 0.025 | 0.09 | 0.585 | 1.56 | 4.3 | 1.12 | 30 | 0.05 | 0.2 | ||||||||||||
| 1999 | 
 | 0.025 | 0.11 | 0.619 | 2.5 | 4.1 | 1.12 | 30 | 0.05 | 0.2 | ||||||||||||
| 1998 | 
 | 0.025 | 0.16 | 0.698 | 2.7 | 4.0 | 1.09 | 31 | 0.05 | 0.2 | ||||||||||||
| 1997 | 
 | 0.025 | 0.11 | 0.697 | 1.78 | 6.2 | 1.27 | 30 | 0.05 | 0.2 | ||||||||||||
| 1996 | 
 | 0.025 | 0.10 | 0.509 | 2.14 | 2.9 | 0.871 | 24 | 0.05 | 0.2 | ||||||||||||
| 1995 | 
 | 0.025 | 0.18 | 0.618 | 1.47 | 3.1 | 0.857 | 24 | 0.05 | 0.2 | ||||||||||||
| 1994 | 
 | 0.13 | 0.79 | * | 2.58 | 4.7 | 1.26 | 14 | 0.05 | * | ||||||||||||
| 1993 | 
 | 0.06 | 0.17 | 1.24 | 3.77 | 4.9 | 1.64 | 24 | 0.05 | 0.4 | ||||||||||||
| 1992 | 
 | 0.025 | 0.16 | 0.809 | 2.78 | 5.6 | 1.37 | 24 | 0.05 | 0.3 | ||||||||||||
| 1991 | 
 | 0.05 | 0.40 | 1.10 | 3.53 | 4.8 | 1.50 | 24 | 0.05 | 0.4 | ||||||||||||
| 1990 | 
 | 0.025 | * | * | * | 26 | 8.83 | 8 | 0.05 | * | ||||||||||||
| 1989 | 
 | * | * | * | * | * | * | 0 | * | * | ||||||||||||
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|  | Notes: | Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value. |  |