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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		0.01	0.02	*	0.03	0.03	0.008	12	0.02	*
2011		0.01	0.03	0.026	0.05	0.05	0.013	30	0.02	2
2010		0.01	0.03	0.024	0.04	0.05	0.013	30	0.02	2
2009		0.01	0.02	0.025	0.04	0.07	0.015	31	0.02	2
2008		0.01	0.02	0.025	0.05	0.05	0.015	31	0.02	2
2007		0.01	0.02	0.024	0.05	0.05	0.015	29	0.02	2
2006		0.01	0.02	0.022	0.04	0.05	0.013	30	0.02	2
2005		0.01	0.02	0.025	0.05	0.06	0.014	31	0.02	2
2004		0.01	0.03	0.028	0.04	0.06	0.012	30	0.02	2
2003		0.01	0.03	0.027	0.04	0.06	0.015	31	0.02	2
2002		0.01	0.03	0.029	0.04	0.07	0.013	30	0.02	2
2001		0.01	0.03	0.027	0.04	0.05	0.012	31	0.02	2
2000		0.01	0.03	*	0.04	0.06	0.013	24	0.02	*
1999		0.01	0.03	*	0.07	0.07	0.021	16	0.02	*
1998		0.01	0.02	*	0.05	0.19	0.036	25	0.02	*
1997		0.01	0.02	*	0.04	0.05	0.013	27	0.02	*
1996		0.01	0.02	0.027	0.05	0.08	0.019	31	0.02	2
1995		0.01	0.02	0.025	0.04	0.10	0.020	30	0.02	2
1994		0.01	0.01	0.014	0.03	0.04	0.009	30	0.02	1
1993		0.01	0.01	0.016	0.03	0.04	0.009	30	0.02	1
1992		0.01	0.01	*	0.01	0.02	0.003	16	0.02	*
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.