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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	0.026	0.025	0.06	0.006	31	0.05	0.09
2003		0.025	0.025	*	0.025	0.16	0.027	27	0.05	*
2002		0.025	0.025	0.029	0.05	0.08	0.013	31	0.05	0.1
2001		0.025	0.025	0.032	0.06	0.09	0.018	30	0.05	0.1
2000		0.025	0.025	0.031	0.025	0.10	0.022	31	0.05	0.1
1999		0.025	0.025	0.043	0.025	0.57	0.100	30	0.05	0.1
1998		0.025	0.025	0.045	0.10	0.20	0.052	30	0.05	0.1
1997		0.025	0.025	0.028	0.025	0.06	0.009	31	0.05	0.09
1996		0.025	0.025	0.031	0.025	0.11	0.018	24	0.05	0.1
1995		0.025	0.025	0.030	0.025	0.07	0.013	24	0.05	0.1
1994		0.025	0.025	*	0.06	0.08	0.017	14	0.05	*
1993		0.025	0.025	0.047	0.09	0.12	0.030	24	0.05	0.2
1992		0.025	0.025	0.043	0.10	0.13	0.035	24	0.05	0.1
1991		0.025	0.025	0.053	0.10	0.30	0.064	24	0.05	0.2
1990		0.025	*	*	*	0.45	0.152	8	0.05	*
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.