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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		1.05	1.05	*	1.05	1.05	0.00	12	2.1	*
2013		0.75	0.75	*	0.75	0.75	0.04	26	1.5	*
2012		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5	7
2011		0.75	0.75	*	0.75	0.75	0.00	21	1.5	*
2010		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5	7
2009		0.75	0.75	0.75	0.75	0.75	0.00	30	1.5	7
2008		*	*	*	*	*	*	0	*	*
2007		0.75	0.75	*	0.75	2.4	0.43	20	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1	*	*	*	2.0	0.45	5	2.0	*
2002		1	1	1.25	1	1	0.25	30	2.0	12
2001		1.5	1.5	*	1.5	8.0	1.23	28	3.0	*
2000		1.5	1.5	1.50	1.5	1.5	0.00	31	3.0	15
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		0.3	1.0	1.10	1.8	3.7	0.73	28	0.2	11
1994		0.4	0.9	1.14	1.7	2.8	0.57	29	0.2	11
1993		0.3	0.9	0.91	1.3	2.2	0.43	29	0.2	9
1992		*	*	*	*	*	*	0	*	*
1991		0.2	0.5	*	1.2	1.6	0.44	20	0.4	*
1990		0.4	0.9	*	1.7	2.1	0.51	16	0.4	*
1989		*	*	*	*	*	*	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.