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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		0.87	0.87	*	0.87	0.87	0.00	13	1.74	*
2023		0.87	0.87	0.87	0.87	0.87	0.00	31	1.74	9
2022		0.87	0.87	0.87	0.87	0.87	0.00	31	1.74	9
2021		0.87	0.87	*	0.87	2.3	0.29	23	1.74	*
2020		0.87	*	*	*	0.87	0.00	8	1.74	*
2019		0.87	0.87	0.87	0.87	0.87	0.00	30	1.74	9
2018		0.87	0.87	0.87	0.87	0.87	0.00	31	1.74	9
2017		0.87	0.87	1.02	0.87	2.9	0.47	30	1.74	10
2016		0.87	0.87	*	0.87	0.87	0.00	27	1.74	*
2015		0.87	0.87	0.87	0.87	0.87	0.00	30	1.74	9
2014		1.05	1.05	1.05	1.05	1.05	0.00	31	2.1	10
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	29	1.5	7
2011		0.75	0.75	*	0.75	2.3	0.31	25	1.5	*
2010		0.75	0.75	0.75	0.75	0.75	0.00	28	1.5	7
2009		0.75	0.75	0.78	0.75	1.8	0.19	30	1.5	8
2008		*	*	*	*	*	*	0	*	*
2007		0.75	0.75	*	3.1	3.7	0.97	19	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1	*	*	*	3.0	0.89	5	2.0	*
2002		1	1	1.25	1	1	0.25	30	2.0	12
2001		1.5	1.5	1.56	1.5	3.0	0.28	28	3.0	15
2000		1.5	1.5	*	1.5	1.5	0.00	11	3.0	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		0.1	0.5	*	1.0	1.8	0.41	15	0.2	*
1995		0.1	0.4	0.68	1.3	2.7	0.61	27	0.2	7
1994		0.2	0.5	*	1.3	3.1	0.61	27	0.2	*
1993		0.1	0.4	*	0.9	1.4	0.34	28	0.2	*
1992		*	*	*	*	*	*	0	*	*
1991		0.2	0.2	*	0.5	0.9	0.18	22	0.4	*
1990		0.2	0.6	0.64	1.0	1.2	0.27	31	0.4	6
1989		0.2	0.7	0.68	1.2	1.7	0.46	12	0.4	7

	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.