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Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2005		*	*	*	*	*	*	0	*	*
2004		0.025	0.025	0.069	0.19	0.26	0.070	31	0.05	0.02
2003		0.025	0.025	*	0.07	0.34	0.062	27	0.05	*
2002		0.025	0.025	0.059	0.11	0.24	0.058	31	0.05	0.02
2001		0.025	0.025	0.060	0.16	0.33	0.077	30	0.05	0.02
2000		0.025	0.025	0.066	0.23	0.27	0.083	31	0.05	0.02
1999		0.025	0.025	0.095	0.22	0.52	0.110	30	0.05	0.03
1998		0.025	0.025	0.100	0.24	0.65	0.132	30	0.05	0.03
1997		0.025	0.025	0.083	0.17	0.30	0.076	31	0.05	0.03
1996		0.025	0.025	0.080	0.17	0.48	0.104	24	0.05	0.03
1995		0.025	0.025	0.100	0.27	0.38	0.112	24	0.05	0.03
1994		0.025	0.18	*	0.44	0.69	0.193	14	0.05	*
1993		0.025	0.11	0.184	0.43	0.61	0.169	24	0.05	0.06
1992		0.025	0.08	0.180	0.47	0.86	0.219	24	0.05	0.06
1991		0.025	0.09	0.175	0.42	1.0	0.240	24	0.05	0.06
1990		0.025	0.09	0.194	0.52	0.70	0.208	24	0.05	0.06
1989		*	*	*	*	*	*	0	*	*

	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.