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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
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		0.85	4.0	*	13.3	18	5.40	12	1.7	*
2013		1.1	5.5	*	10.5	17	3.71	26	1.0	*
2012		1.9	5.7	6.61	10	18	3.28	29	1.5	0.2
2011		4.6	8.7	*	11.8	21	3.71	17	1.5	*
2010		0.75	5.8	*	12.2	16	3.76	19	1.5	*
2009		1.9	9.2	9.43	15	24	4.76	29	1.5	0.3
2008		*	*	*	*	*	*	0	*	*
2007		4.4	11	*	18.6	26	5.87	19	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		4.0	*	*	*	13	3.39	5	3.0	*
2002		4.0	17	18.0	26.1	29	6.20	30	3.0	0.6
2001		2	14.5	*	25.3	28	7.20	28	4.0	*
2000		2	16	15.7	24	31	7.01	31	4.0	0.5
1999		4.0	17	*	25	190	35.4	25	4.0	*
1998		7.0	18	18.6	26.4	35	6.77	29	4.0	0.6
1997		2	17	*	38.6	68	14.0	29	4.0	*
1996		5.0	25	*	37.8	74	13.5	23	4.0	*
1995		5.0	27	27.8	49	93	18.0	31	4.0	1
1994		9.0	29	*	47.6	81	16.4	27	4.0	*
1993		5.0	33	32.6	49	58	14.5	31	4.0	1
1992		10	39	50.0	74	340	61.8	31	4.0	2
1991		10	55	60.7	94.6	230	41.7	28	4.0	2
1990		11	55	63.7	86.2	170	34.9	30	1.0	2
1989		19	67	*	120	228	45.6	34	1.0	*

	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.