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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	*	*
2003		0.025	0.06	0.081	0.17	0.22	0.058	29	0.05	0.03
2002		0.025	0.09	0.116	0.23	0.49	0.099	31	0.05	0.04
2001		0.025	0.06	0.085	0.19	0.35	0.077	29	0.05	0.03
2000		0.025	0.09	0.103	0.21	0.40	0.091	31	0.05	0.03
1999		0.025	0.14	0.132	0.26	0.38	0.095	30	0.05	0.04
1998		0.025	0.12	*	0.15	0.20	0.050	23	0.05	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
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.