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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	*	*
2013		0.75	0.75	*	0.75	0.75	0.04	20	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	1.8	0.21	26	1.5	*
2010		0.75	0.75	0.75	0.75	0.75	0.00	25	1.5	7
2009		0.75	0.75	1.31	0.75	20	3.57	29	1.5	13
2008		*	*	*	*	*	*	0	*	*
2007		0.75	0.75	*	1.6	3.9	0.71	24	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1	*	*	*	3.0	1.00	4	2.0	*
2002		1	1	*	1	3.0	0.44	27	2.0	*
2001		1.5	1.5	1.50	1.5	1.5	0.00	28	3.0	15
2000		1.5	1.5	*	1.5	5.0	0.79	29	3.0	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		0.2	0.4	*	1.0	2.3	0.54	15	0.2	*
1995		0.1	0.7	0.88	1.8	3.2	0.73	29	0.2	9
1994		0.2	0.8	1.14	2.1	4.0	0.87	30	0.2	11
1993		0.1	0.7	0.84	1.6	2.3	0.54	31	0.2	8
1992		*	*	*	*	*	*	0	*	*
1991		0.2	0.2	*	1.2	1.8	0.50	18	0.4	*
1990		0.2	0.9	*	2.2	2.6	0.70	23	0.4	*
1989		0.7	1.2	1.42	2.4	3.2	0.77	12	0.4	14

	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.