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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	*	*
2022		0.01	0.02	*	0.03	0.04	0.009	22	0.02	*
2021		0.01	0.03	*	0.04	0.07	0.013	24	0.02	*
2020		0.01	*	*	*	0.04	0.012	7	0.02	*
2019		0.01	0.03	0.026	0.04	0.05	0.009	30	0.02	2
2018		0.01	0.03	0.032	0.04	0.09	0.017	31	0.02	2
2017		0.02	0.03	0.032	0.04	0.07	0.012	30	0.02	2
2016		0.02	0.04	0.051	0.09	0.13	0.026	31	0.02	4
2015		0.01	0.04	0.038	0.05	0.08	0.014	30	0.02	3
2014		0.01	0.03	0.035	0.06	0.08	0.016	28	0.02	3
2013		0.01	0.03	0.030	0.06	0.09	0.019	31	0.02	2
2012		0.01	0.03	0.030	0.05	0.07	0.015	30	0.02	2
2011		0.01	0.03	0.030	0.05	0.05	0.011	30	0.02	2
2010		0.01	0.03	0.038	0.05	0.06	0.012	24	0.02	3
2009		0.01	0.03	0.025	0.04	0.06	0.015	31	0.02	2
2008		0.01	0.05	*	0.17	0.25	0.073	28	0.02	*
2007		0.01	0.08	0.089	0.18	0.23	0.067	27	0.02	7
2006		0.01	0.02	0.027	0.04	0.07	0.014	29	0.02	2
2005		0.01	0.03	0.040	0.06	0.08	0.019	29	0.02	3
2004		0.01	0.05	0.048	0.08	0.09	0.023	29	0.02	4
2003		0.01	0.04	0.048	0.07	0.16	0.032	28	0.02	4
2002		0.01	0.04	0.041	0.08	0.09	0.022	28	0.02	3
2001		0.01	0.03	*	0.05	0.09	0.017	26	0.02	*
2000		0.01	0.04	0.033	0.06	0.07	0.017	30	0.02	3
1999		0.03	*	*	*	0.03	0.011	1	0.02	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		0.01	*	*	*	0.04	0.011	8	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.