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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		0.05	0.16	*	0.41	0.45	0.122	15	0.1	*
2013		0.05	0.19	0.291	0.38	2.5	0.442	29	0.1	3
2012		0.05	0.17	0.206	0.34	0.39	0.091	29	0.1	2
2011		0.12	0.34	0.439	0.66	2.2	0.406	27	0.1	4
2010		0.11	0.61	1.29	2.5	14	2.69	29	0.1	13
2009		0.11	0.28	0.343	0.52	1.4	0.24	31	0.1	3
2008		0.18	0.61	1.12	1.74	7.5	1.59	30	0.1	11
2007		0.05	0.43	1.74	2.92	24	4.40	29	0.1	17
2006		0.05	0.28	0.302	0.5	0.83	0.167	31	0.1	3
2005		0.1	0.39	0.42	0.7	1.0	0.236	29	0.1	4
2004		0.13	0.39	0.411	0.69	1.2	0.239	30	0.1	4
2003		0.18	0.46	*	1.25	2.3	0.475	26	0.1	*
2002		0.1	0.43	0.603	1.1	1.5	0.404	31	0.1	6
2001		0.2	0.5	0.603	1.21	2.1	0.441	30	0.1	6
2000		0.5	0.5	0.80	1.4	3.0	0.56	29	1.0	8
1999		0.5	1.1	*	2.4	4.3	0.94	24	1.0	*
1998		0.5	0.5	1.07	2.3	3.3	0.77	29	1.0	11
1997		0.5	1.1	1.11	1.9	2.6	0.63	29	1.0	11
1996		0.5	1.4	1.41	1.8	4.3	0.81	30	1.0	14
1995		0.5	1.6	1.82	3.3	4.2	1.00	31	1.0	18
1994		0.5	1.9	1.94	3.2	4.0	1.01	29	1.0	19
1993		0.5	1.7	2.01	3.1	7.4	1.45	33	1.0	20
1992		0.5	1.1	1.42	3.0	5.1	1.22	30	1.0	14
1991		0.5	1.3	1.69	3.6	5.4	1.37	27	1.0	17
1990		1.3	2.5	3.25	6.1	7.2	1.72	29	1.0	32
1989		0.5	2.2	*	4.7	5.7	1.74	12	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.