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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	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		0.04	*	*	*	0.87	0.371	5	0.02	*
2009		0.01	*	*	*	0.83	0.329	9	0.02	*
2008		0.02	*	*	*	0.02	0.032	1	0.02	*
2007		0.07	*	*	*	0.13	0.032	3	0.02	*
2006		0.02	0.09	*	0.20	0.35	0.087	16	0.02	*
2005		0.03	0.24	*	0.40	0.53	0.146	17	0.02	*
2004		0.03	*	*	*	1.2	0.359	10	0.02	*
2003		0.06	0.12	*	0.48	0.84	0.211	17	0.02	*
2002		0.04	0.15	*	0.83	1.2	0.345	19	0.02	*
2001		0.01	0.04	0.167	0.32	1.7	0.365	27	0.02	13
2000		0.01	0.03	0.032	0.04	0.09	0.018	29	0.02	2
1999		0.01	0.02	*	0.05	0.05	0.016	23	0.02	*
1998		0.01	0.03	*	0.05	0.16	0.031	22	0.02	*
1997		0.01	0.03	*	0.04	0.04	0.012	14	0.02	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
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.