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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
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		0.14	0.34	*	0.82	2.2	0.583	11	0.1	*
2021		0.2	0.45	*	0.74	1.0	0.209	22	0.1	*
2020		0.17	*	*	*	0.24	0.029	5	0.1	*
2019		0.11	0.2	*	0.81	3.4	0.754	20	0.1	*
2018		0.11	0.24	*	0.4	0.51	0.116	20	0.1	*
2017		0.11	0.23	0.261	0.43	0.5	0.112	29	0.1	3
2016		0.1	0.32	0.338	0.59	0.91	0.192	31	0.1	3
2015		0.05	0.34	0.434	1.01	1.2	0.301	26	0.1	4
2014		0.21	0.46	*	0.78	0.85	0.21	23	0.1	*
2013		0.1	0.34	0.412	0.76	1.1	0.25	31	0.1	4
2012		0.05	0.29	0.354	0.59	1.0	0.216	29	0.1	4
2011		0.13	0.35	0.433	0.82	1.1	0.278	31	0.1	4
2010		0.14	0.42	0.721	1.08	9.1	1.64	29	0.1	7
2009		0.05	0.32	0.323	0.49	0.83	0.169	29	0.1	3
2008		0.05	0.33	0.433	0.81	1.0	0.255	29	0.1	4
2007		0.11	0.31	0.338	0.58	0.66	0.18	23	0.1	3
2006		0.05	0.28	*	0.55	0.85	0.189	25	0.1	*
2005		0.12	0.41	0.437	0.68	0.93	0.226	30	0.1	4
2004		0.18	0.42	0.504	0.72	2.0	0.377	24	0.1	5
2003		0.19	0.41	0.586	0.77	3.5	0.604	29	0.1	6
2002		0.14	0.5	*	1.0	1.2	0.326	23	0.1	*
2001		0.19	0.69	0.737	1.19	2.7	0.528	28	0.1	7
2000		0.5	0.5	0.68	1.5	1.6	0.39	29	1.0	7
1999		0.5	1.1	1.20	1.9	4.5	0.97	18	1.0	12
1998		0.5	0.5	0.80	1.3	2.5	0.54	29	1.0	8
1997		0.5	1.1	*	1.8	2.2	0.55	22	1.0	*
1996		0.5	1.1	1.10	1.8	3.3	0.67	28	1.0	11
1995		0.5	1.7	1.51	2.2	3.4	0.82	31	1.0	15
1994		0.5	1.1	1.06	1.9	2.6	0.68	30	1.0	10
1993		0.5	0.5	1.05	1.5	6.6	1.20	26	1.0	10
1992		0.5	0.5	0.68	1.3	1.9	0.41	31	1.0	7
1991		0.5	0.5	2.72	2.6	22	4.63	25	1.0	27
1990		0.5	1.4	1.28	2.0	2.6	0.63	28	1.0	13
1989		0.5	1.2	*	2.8	5.0	1.19	21	1.0	*

	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.