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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
2025		*	*	*	*	*	*	0	*	*
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		0.955	3	*	5	13	2.7	15	1.91	*
2020		0.955	*	*	*	7	2.0	7	1.91	*
2019		0.955	2	*	5	13	2.7	28	1.91	*
2018		0.955	3	3.8	6	15	3.1	32	1.91	3
2017		0.955	3	3.3	6	12	2.9	32	1.91	2
2016		0.955	0.955	3.4	4	62	10.8	32	1.91	3
2015		0.955	0.955	17.6	4	569	102	31	1.91	13
2014		0.95	2	2.5	5	11	2.3	31	1.9	2
2013		5	3	*	6	37	6.5	30	1.3	*
2012		4.5	4.5	4.5	4.5	4.5	0.0	30	9	3
2011		4.5	4.5	6.5	4.5	76	12.8	31	9	5
2010		4.5	4.5	4.5	4.5	4.5	0.0	28	9	3
2009		4.5	4.5	5.3	4.5	15	2.5	32	9	4
2008		*	*	*	*	*	*	0	*	*
2007		4.5	9	10.0	26	36	8.8	35	9	7
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1	*	*	*	7	2.5	5	1	*
2002		1	5	6.1	15	19	5.3	35	1	5
2001		1	3	3.7	8	10	2.8	35	2	3
2000		1	4	4.2	7	14	3.2	33	2	3
1999		1	4	5.3	12	18	4.5	31	2	4
1998		1	2	2.8	5	10	2.4	31	2	2
1997		1	4	4.2	7	8	2.2	29	2	3
1996		1	3	3.5	7	24	4.4	32	2	3
1995		1	3	*	6	12	2.7	27	2	*
1994		1	4	4.1	6	8	2.1	34	2	3
1993		1	4	4.5	7	17	3.4	31	2	3
1992		1	5	4.3	8	9	2.4	30	2	3
1991		2	6	9.0	16	41	8.2	31	2	7
1990		1	7	9.1	18	32	7.2	32	1	7
1989		0.5	5	7.3	14	42	7.1	60	1	5

	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.