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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	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		0.95	0.95	*	3	4	1.1	12	1.9	*
2013		5	2	*	5	8	1.8	26	1.3	*
2012		4.5	4.5	6.9	4.5	90	15.9	29	9	5
2011		4.5	4.5	*	4.5	10	1.1	23	9	*
2010		4.5	4.5	5.2	4.5	14	2.4	29	9	4
2009		4.5	4.5	6.0	13	20	4.2	30	9	4
2008		*	*	*	*	*	*	0	*	*
2007		4.5	4.5	8.1	18	23	6.0	28	9	6
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		2	*	*	*	6	1.5	5	1	*
2002		2	5	5.6	8	10	2.4	30	1	4
2001		1	5	*	9	10	2.8	28	2	*
2000		1	5	5.6	8	15	3.0	31	2	4
1999		1	5	*	10	12	3.1	25	2	*
1998		1	5	4.4	7	9	2.0	29	2	3
1997		1	5	*	7	10	2.1	29	2	*
1996		1	5	*	8	10	2.3	23	2	*
1995		1	5	4.8	9	10	2.9	31	2	4
1994		1	5	*	9	10	2.4	27	2	*
1993		1	5	5.6	8	12	2.6	31	2	4
1992		1	4	6.8	9	35	7.2	31	2	5
1991		1	7	7.5	13	20	4.5	28	2	6
1990		1	6	6.9	13	27	4.8	30	1	5
1989		2	7	*	11	39	7.5	34	1	*

	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.