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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	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		0.03	*	*	*	0.03	0.012	1	0.01	*
2011		0.005	0.005	0.012	0.03	0.05	0.012	30	0.01	1
2010		0.005	0.01	0.012	0.02	0.04	0.008	30	0.01	1
2009		0.005	0.01	0.013	0.03	0.04	0.012	32	0.01	2
2008		0.005	0.01	0.015	0.03	0.04	0.010	31	0.01	2
2007		0.005	0.02	0.015	0.03	0.03	0.009	29	0.01	2
2006		0.005	0.02	0.020	0.04	0.05	0.012	31	0.01	2
2005		0.005	0.02	0.028	0.05	0.13	0.025	34	0.01	3
2004		0.005	0.02	0.023	0.04	0.06	0.015	30	0.01	3
2003		0.005	0.03	0.031	0.06	0.08	0.021	31	0.01	4
2002		0.005	0.03	0.034	0.05	0.08	0.017	31	0.01	4
2001		0.005	0.04	0.046	0.08	0.17	0.040	30	0.01	5
2000		0.01	0.05	0.056	0.10	0.18	0.039	30	0.01	7
1999		0.005	0.04	*	0.08	0.10	0.027	19	0.01	*
1998		0.01	0.03	*	0.07	0.18	0.042	15	0.01	*
1997		0.01	0.04	0.043	0.09	0.14	0.031	29	0.01	5
1996		0.01	0.03	0.041	0.08	0.15	0.029	31	0.01	5
1995		0.02	0.05	0.065	0.15	0.31	0.071	30	0.01	8
1994		0.005	0.04	0.062	0.12	0.25	0.067	31	0.01	7
1993		0.02	0.07	0.100	0.19	0.45	0.091	30	0.01	12
1992		0.04	0.09	0.102	0.18	0.27	0.055	30	0.01	12
1991		0.02	0.11	0.142	0.26	0.69	0.128	30	0.01	17
1990		0.04	0.08	*	0.24	0.47	0.100	24	0.01	*
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.