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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		0.01	0.03	*	0.04	0.10	0.017	24	0.02	*
2016		0.02	0.04	0.042	0.07	0.10	0.021	31	0.02	3
2015		0.02	0.03	0.034	0.05	0.06	0.010	30	0.02	3
2014		0.01	0.03	0.028	0.04	0.08	0.014	31	0.02	2
2013		0.01	0.02	0.051	0.08	0.55	0.098	30	0.02	4
2012		0.01	0.02	0.028	0.03	0.25	0.043	30	0.02	2
2011		0.01	0.03	0.030	0.06	0.11	0.024	30	0.02	2
2010		0.01	0.03	0.025	0.04	0.07	0.013	30	0.02	2
2009		0.01	0.02	0.025	0.05	0.07	0.018	31	0.02	2
2008		0.01	0.02	0.022	0.04	0.05	0.012	31	0.02	2
2007		0.01	0.02	0.027	0.05	0.08	0.018	30	0.02	2
2006		0.01	0.02	0.023	0.03	0.07	0.012	30	0.02	2
2005		0.01	0.03	0.027	0.05	0.07	0.016	31	0.02	2
2004		0.01	0.02	0.026	0.05	0.08	0.018	30	0.02	2
2003		0.01	0.03	0.028	0.05	0.06	0.014	30	0.02	2
2002		0.01	0.03	0.029	0.04	0.06	0.012	28	0.02	2
2001		0.01	0.02	0.023	0.03	0.05	0.010	31	0.02	2
2000		0.01	0.02	0.025	0.05	0.09	0.019	31	0.02	2
1999		0.01	0.02	*	0.03	0.04	0.011	23	0.02	*
1998		0.01	0.03	0.032	0.05	0.11	0.022	25	0.02	2
1997		0.01	0.02	0.022	0.03	0.10	0.018	28	0.02	2
1996		0.01	0.03	0.032	0.05	0.09	0.020	31	0.02	2
1995		0.01	0.03	0.029	0.06	0.09	0.021	30	0.02	2
1994		0.01	0.01	0.018	0.03	0.13	0.023	30	0.02	1
1993		0.01	0.02	*	0.04	0.12	0.022	33	0.02	*
1992		0.01	0.01	0.020	0.04	0.04	0.012	28	0.02	2
1991		0.01	0.02	0.027	0.05	0.12	0.026	29	0.02	2
1990		0.01	0.02	0.027	0.06	0.09	0.023	30	0.02	2
1989		0.01	0.04	0.035	0.06	0.08	0.019	23	0.02	3

	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.