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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	0.09	0.164	0.46	0.65	0.178	31	0.05	0.05
2003		0.025	0.06	*	0.16	0.89	0.166	27	0.05	*
2002		0.025	0.06	0.138	0.29	0.60	0.157	31	0.05	0.04
2001		0.025	0.08	0.144	0.37	0.82	0.192	30	0.05	0.05
2000		0.025	0.10	0.176	0.61	0.73	0.216	31	0.05	0.06
1999		0.025	0.14	0.227	0.52	0.69	0.197	30	0.05	0.07
1998		0.025	0.14	0.257	0.59	1.6	0.321	30	0.05	0.08
1997		0.025	0.14	0.213	0.43	0.70	0.190	31	0.05	0.07
1996		0.025	0.13	0.219	0.46	1.2	0.262	24	0.05	0.07
1995		0.025	0.13	0.254	0.67	0.93	0.273	24	0.05	0.08
1994		0.09	0.43	*	1.07	1.6	0.447	14	0.05	*
1993		0.025	0.26	0.420	1.0	1.4	0.380	24	0.05	0.1
1992		0.025	0.21	0.453	1.27	1.9	0.516	24	0.05	0.1
1991		0.025	0.26	0.445	1.07	2.3	0.553	24	0.05	0.1
1990		0.025	0.26	0.546	1.42	2.0	0.569	24	0.05	0.2
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.