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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	0.07	0.106	0.24	0.52	0.114	31	0.05	0.03
2003		0.025	0.05	0.096	0.18	0.45	0.093	31	0.05	0.03
2002		0.025	0.07	0.127	0.36	0.45	0.129	31	0.05	0.04
2001		0.025	0.025	0.120	0.37	0.52	0.147	30	0.05	0.04
2000		0.025	0.08	0.126	0.30	0.70	0.156	31	0.05	0.04
1999		0.025	0.07	0.129	0.32	0.59	0.147	30	0.05	0.04
1998		0.025	0.12	0.181	0.34	1.4	0.271	29	0.05	0.06
1997		0.025	0.07	*	0.29	0.69	0.153	29	0.05	*
1996		0.025	0.11	0.158	0.41	0.50	0.145	24	0.05	0.05
1995		0.025	0.13	*	0.39	0.91	0.218	20	0.05	*
1994		0.06	0.39	*	0.62	1.0	0.253	14	0.05	*
1993		0.025	0.16	0.274	0.64	1.2	0.290	24	0.05	0.09
1992		0.025	0.10	0.196	0.42	1.2	0.254	24	0.05	0.06
1991		0.025	0.13	0.256	0.63	0.92	0.261	24	0.05	0.08
1990		0.025	0.14	0.271	0.66	1.2	0.315	24	0.05	0.09
1989		0.025	0.16	*	1.76	2.4	0.712	19	0.05	*

	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.