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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		0.65	0.65	*	0.65	0.65	0.00	16	1.3	*
2024		0.65	0.65	0.65	0.65	0.65	0.00	30	1.3	8
2023		0.65	0.65	0.65	0.65	0.65	0.00	26	1.3	8
2022		0.65	0.65	0.65	0.65	0.65	0.00	31	1.3	8
2021		0.65	0.65	*	0.65	1.6	0.20	23	1.3	*
2020		0.65	*	*	*	0.65	0.00	9	1.3	*
2019		0.65	0.65	0.65	0.65	0.65	0.00	29	1.3	8
2018		0.65	0.65	0.90	0.65	6.6	1.08	30	1.3	11
2017		0.65	0.65	0.70	0.65	1.9	0.23	28	1.3	9
2016		0.65	0.65	0.65	0.65	0.65	0.00	30	1.3	8
2015		0.65	0.65	0.65	0.65	0.65	0.00	30	1.3	8
2014		0.85	0.85	0.93	0.85	1.8	0.23	30	1.7	11
2013		0.75	0.75	*	0.75	0.75	0.04	28	1.5	*
2012		0.75	0.75	0.75	0.75	0.75	0.00	30	1.5	9
2011		0.75	0.75	0.75	0.75	0.75	0.00	29	1.5	9
2010		0.75	0.75	*	0.75	4.6	0.82	22	1.5	*
2009		0.75	0.75	0.75	0.75	0.75	0.00	31	1.5	9
2008		*	*	*	*	*	*	0	*	*
2007		0.75	0.75	*	0.75	1.6	0.19	20	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		0.025	0.14	*	0.21	0.43	0.098	15	0.05	*
1995		0.05	0.18	0.259	0.43	1.4	0.268	30	0.05	3
1994		0.07	0.19	0.256	0.65	0.85	0.204	31	0.05	3
1993		0.09	0.29	0.315	0.56	0.87	0.182	29	0.05	4
1992		*	*	*	*	*	*	0	*	*
1991		0.4	1.6	*	2.5	3.4	0.73	23	0.2	*
1990		0.1	1.3	1.25	2.0	2.5	0.62	30	0.2	15
1989		1.0	1.8	1.95	2.8	3.3	0.71	12	0.2	24

	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.