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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		0.01	0.03	*	0.04	0.05	0.012	22	0.02	*
2012		0.02	0.04	0.037	0.05	0.07	0.013	29	0.02	3
2011		0.02	0.03	0.039	0.06	0.09	0.019	30	0.02	3
2010		0.01	0.05	0.060	0.10	0.14	0.027	26	0.02	5
2009		0.04	0.08	0.097	0.16	0.25	0.053	30	0.02	7
2008		0.02	0.04	0.047	0.07	0.11	0.023	30	0.02	4
2007		0.02	0.05	0.058	0.09	0.12	0.025	29	0.02	4
2006		0.01	0.07	0.071	0.10	0.13	0.026	30	0.02	5
2005		0.01	0.03	*	0.06	0.06	0.018	26	0.02	*
2004		0.02	0.03	0.039	0.06	0.08	0.016	31	0.02	3
2003		0.01	0.05	0.050	0.07	0.11	0.020	27	0.02	4
2002		0.01	0.03	0.039	0.06	0.10	0.020	26	0.02	3
2001		0.01	0.03	*	0.05	0.20	0.037	26	0.02	*
2000		0.01	0.04	0.048	0.06	0.33	0.058	28	0.02	4
1999		0.01	0.03	0.032	0.05	0.09	0.023	20	0.02	2
1998		0.01	0.03	0.040	0.06	0.22	0.041	28	0.02	3
1997		0.01	0.03	0.032	0.05	0.06	0.013	30	0.02	2
1996		0.01	0.03	*	0.07	0.53	0.107	22	0.02	*
1995		0.01	0.04	0.041	0.07	0.09	0.019	31	0.02	3
1994		0.01	0.02	0.027	0.05	0.08	0.019	30	0.02	2
1993		0.01	0.03	0.042	0.07	0.09	0.020	32	0.02	3
1992		0.01	0.05	0.059	0.11	0.15	0.037	30	0.02	4
1991		0.01	0.03	0.036	0.06	0.08	0.020	28	0.02	3
1990		0.01	0.04	0.052	0.08	0.32	0.057	30	0.02	4
1989		0.03	0.05	*	0.10	0.19	0.038	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.