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Read About New Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		0.01	*	*	*	0.04	0.012	9	0.02	*
2001		0.01	0.03	*	0.05	0.06	0.013	28	0.02	*
2000		0.01	0.03	0.028	0.05	0.07	0.018	29	0.02	2
1999		0.01	0.03	*	0.05	0.06	0.013	24	0.02	*
1998		0.01	0.03	*	0.07	0.07	0.019	26	0.02	*
1997		0.01	0.03	0.032	0.06	0.13	0.024	27	0.02	2
1996		0.01	0.03	0.030	0.07	0.08	0.020	31	0.02	2
1995		0.01	0.03	0.030	0.05	0.08	0.017	30	0.02	2
1994		0.01	0.01	0.018	0.04	0.07	0.014	30	0.02	1
1993		0.01	0.03	0.029	0.06	0.07	0.018	30	0.02	2
1992		0.01	0.01	0.022	0.05	0.06	0.017	31	0.02	2
1991		0.01	0.02	0.029	0.05	0.14	0.027	28	0.02	2
1990		0.01	0.02	0.024	0.04	0.07	0.017	27	0.02	2
1989		0.01	0.02	*	0.04	0.06	0.014	21	0.02	*

	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.