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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		0.01	0.03	0.032	0.05	0.06	0.014	30	0.02	2
2012		0.01	0.03	0.035	0.05	0.07	0.012	30	0.02	3
2011		0.01	0.03	0.031	0.05	0.06	0.013	31	0.02	2
2010		0.01	0.04	0.037	0.05	0.07	0.015	30	0.02	3
2009		0.01	0.03	0.033	0.05	0.08	0.019	31	0.02	3
2008		0.01	0.03	0.036	0.05	0.06	0.015	30	0.02	3
2007		0.01	0.03	0.029	0.05	0.06	0.015	28	0.02	2
2006		0.01	0.03	0.030	0.05	0.06	0.016	32	0.02	2
2005		0.01	0.03	0.033	0.06	0.08	0.020	28	0.02	2
2004		0.01	0.03	0.033	0.05	0.06	0.015	30	0.02	2
2003		0.01	0.04	0.043	0.07	0.08	0.019	30	0.02	3
2002		0.01	0.04	0.041	0.07	0.11	0.022	29	0.02	3
2001		0.01	0.03	0.031	0.05	0.07	0.014	30	0.02	2
2000		0.01	0.03	0.052	0.07	0.44	0.080	28	0.02	4
1999		0.01	0.03	0.038	0.08	0.11	0.029	24	0.02	3
1998		0.01	0.03	*	0.05	0.08	0.018	19	0.02	*
1997		0.01	0.03	0.035	0.05	0.08	0.017	25	0.02	3
1996		0.01	0.03	0.038	0.06	0.08	0.019	30	0.02	3
1995		0.01	0.04	0.047	0.09	0.11	0.028	29	0.02	4
1994		0.01	0.02	*	0.05	0.15	0.029	28	0.02	*
1993		0.01	0.03	0.035	0.06	0.13	0.027	28	0.02	3
1992		0.01	0.03	0.037	0.07	0.09	0.026	29	0.02	3
1991		0.01	0.02	0.031	0.07	0.08	0.023	29	0.02	2
1990		0.01	0.03	0.029	0.05	0.06	0.015	31	0.02	2
1989		0.01	0.04	0.041	0.06	0.07	0.018	24	0.02	3

	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.