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| Year | Months Present | Minimum | Median | Mean | 90th Percentile | Maximum | Standard Deviation | Number of Observations | Detection Limit | ||||||||||||
| 2025 | 
 | 0.015 | 0.015 | * | 0.015 | 0.015 | 0.000 | 20 | 0.03 | ||||||||||||
| 2024 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.03 | 0.003 | 29 | 0.03 | ||||||||||||
| 2023 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 30 | 0.03 | ||||||||||||
| 2022 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 30 | 0.03 | ||||||||||||
| 2021 | 
 | 0.015 | 0.015 | * | 0.015 | 0.015 | 0.000 | 22 | 0.03 | ||||||||||||
| 2020 | 
 | 0.015 | * | * | * | 0.015 | 0.000 | 9 | 0.03 | ||||||||||||
| 2019 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 30 | 0.03 | ||||||||||||
| 2018 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 31 | 0.03 | ||||||||||||
| 2017 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 28 | 0.03 | ||||||||||||
| 2016 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 30 | 0.03 | ||||||||||||
| 2015 | 
 | 0.015 | 0.015 | 0.015 | 0.015 | 0.015 | 0.000 | 30 | 0.03 | ||||||||||||
| 2014 | 
 | 0.015 | 0.015 | * | 0.03 | 0.05 | 0.009 | 27 | 0.03 | ||||||||||||
| 2013 | 
 | 0.015 | 0.015 | 0.016 | 0.015 | 0.04 | 0.004 | 31 | 0.03 | ||||||||||||
| 2012 | 
 | 0.015 | 0.015 | 0.020 | 0.04 | 0.06 | 0.012 | 29 | 0.03 | ||||||||||||
| 2011 | 
 | 0.015 | 0.015 | 0.020 | 0.015 | 0.08 | 0.016 | 32 | 0.03 | ||||||||||||
| 2010 | 
 | 0.015 | 0.015 | 0.019 | 0.015 | 0.07 | 0.013 | 30 | 0.03 | ||||||||||||
| 2009 | 
 | 0.015 | 0.015 | 0.020 | 0.03 | 0.09 | 0.015 | 31 | 0.03 | ||||||||||||
| 2008 | 
 | 0.015 | 0.015 | 0.020 | 0.04 | 0.07 | 0.013 | 31 | 0.03 | ||||||||||||
| 2007 | 
 | 0.015 | 0.015 | 0.027 | 0.05 | 0.18 | 0.033 | 30 | 0.03 | ||||||||||||
| 2006 | 
 | 0.015 | 0.015 | 0.025 | 0.05 | 0.10 | 0.025 | 30 | 0.03 | ||||||||||||
| 2005 | 
 | 0.015 | 0.015 | 0.030 | 0.05 | 0.34 | 0.060 | 31 | 0.03 | ||||||||||||
| 2004 | 
 | 0.015 | 0.015 | 0.023 | 0.05 | 0.12 | 0.023 | 30 | 0.03 | ||||||||||||
| 2003 | 
 | 0.015 | 0.015 | 0.031 | 0.05 | 0.23 | 0.048 | 31 | 0.03 | ||||||||||||
| 2002 | 
 | 0.015 | * | * | * | 0.05 | 0.017 | 6 | 0.03 | ||||||||||||
| 2001 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 2000 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1999 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1998 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1997 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1996 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1995 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1994 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1993 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1992 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1991 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 1990 | 
 | * | * | * | * | * | * | 0 | * | ||||||||||||
| 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. |  |