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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	0.05	0.157	0.56	0.83	0.226	31	0.05	0.5
2003		0.025	0.025	*	0.13	1.0	0.190	27	0.05	*
2002		0.025	0.025	0.086	0.21	0.48	0.105	31	0.05	0.3
2001		0.025	0.025	0.110	0.36	0.67	0.169	30	0.05	0.4
2000		0.025	0.025	0.147	0.57	0.67	0.211	31	0.05	0.5
1999		0.025	0.09	0.175	0.50	0.58	0.189	30	0.05	0.6
1998		0.025	0.07	0.227	0.66	1.8	0.371	30	0.05	0.7
1997		0.025	0.08	0.172	0.40	0.65	0.184	31	0.05	0.5
1996		0.025	0.06	0.151	0.46	0.81	0.213	24	0.05	0.5
1995		0.025	0.08	0.196	0.52	1.2	0.304	24	0.05	0.6
1994		0.025	0.20	*	0.61	0.75	0.259	14	0.05	*
1993		0.025	0.14	0.332	0.98	1.4	0.398	24	0.05	1
1992		0.025	0.11	0.313	0.84	1.8	0.432	24	0.05	1
1991		0.025	0.11	0.302	0.71	2.0	0.493	24	0.05	1
1990		0.025	0.14	0.336	0.78	1.7	0.404	24	0.05	1
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.