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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
2023		0.01	0.02	*	0.03	0.05	0.012	20	0.02	*
2022		0.01	0.02	0.020	0.04	0.06	0.013	31	0.02	2
2021		0.01	0.01	*	0.04	0.05	0.015	23	0.02	*
2020		0.01	*	*	*	0.05	0.014	7	0.02	*
2019		0.01	0.03	0.027	0.04	0.06	0.013	28	0.02	2
2018		0.01	0.03	0.033	0.05	0.07	0.014	28	0.02	2
2017		0.01	0.03	0.032	0.05	0.07	0.016	29	0.02	2
2016		0.01	0.04	0.045	0.06	0.20	0.034	30	0.02	3
2015		0.01	0.03	0.033	0.05	0.09	0.016	30	0.02	2
2014		0.01	0.03	0.038	0.07	0.08	0.022	30	0.02	3
2013		0.01	0.03	0.030	0.05	0.06	0.014	31	0.02	2
2012		0.01	0.03	0.033	0.05	0.07	0.015	29	0.02	2
2011		0.01	0.03	0.031	0.05	0.08	0.018	31	0.02	2
2010		0.01	0.03	*	0.05	0.06	0.017	19	0.02	*
2009		0.01	0.03	0.027	0.05	0.07	0.016	31	0.02	2
2008		0.01	0.03	0.028	0.05	0.06	0.016	29	0.02	2
2007		0.01	0.03	0.035	0.05	0.16	0.028	28	0.02	3
2006		0.01	0.02	0.023	0.05	0.05	0.014	31	0.02	2
2005		0.01	0.03	0.032	0.05	0.07	0.017	30	0.02	2
2004		0.01	0.02	0.027	0.05	0.09	0.019	31	0.02	2
2003		0.01	0.03	0.038	0.07	0.10	0.023	30	0.02	3
2002		0.01	0.03	0.037	0.07	0.08	0.023	30	0.02	3
2001		0.01	0.02	0.024	0.04	0.05	0.014	31	0.02	2
2000		0.01	0.03	0.031	0.04	0.08	0.018	31	0.02	2
1999		0.01	0.03	0.033	0.06	0.16	0.033	23	0.02	3
1998		0.01	0.03	*	0.05	0.06	0.016	23	0.02	*
1997		0.01	0.03	0.026	0.05	0.07	0.017	30	0.02	2
1996		0.01	0.01	0.020	0.04	0.07	0.014	30	0.02	2
1995		0.01	0.03	*	0.04	0.26	0.068	12	0.02	*
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.