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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		0.01	0.03	*	0.05	0.06	0.015	15	0.02	*
2022		0.01	0.03	0.031	0.04	0.06	0.012	29	0.02	2
2021		0.01	0.03	*	0.05	0.06	0.012	23	0.02	*
2020		0.01	*	*	*	0.06	0.017	7	0.02	*
2019		0.01	0.04	0.038	0.07	0.10	0.022	29	0.02	3
2018		0.01	0.04	0.041	0.06	0.11	0.019	36	0.02	3
2017		0.02	0.05	0.051	0.08	0.09	0.020	31	0.02	4
2016		0.03	0.05	0.054	0.08	0.11	0.022	31	0.02	4
2015		0.02	0.04	0.044	0.06	0.09	0.016	30	0.02	3
2014		0.03	0.04	*	0.06	0.07	0.014	16	0.02	*
2013		0.02	0.04	*	0.05	0.06	0.011	23	0.02	*
2012		0.01	0.04	0.039	0.06	0.07	0.012	33	0.02	3
2011		0.01	0.04	0.037	0.06	0.07	0.016	33	0.02	3
2010		0.01	0.04	0.037	0.06	0.08	0.017	30	0.02	3
2009		0.01	0.03	0.034	0.05	0.08	0.017	34	0.02	3
2008		0.01	0.03	0.035	0.06	0.07	0.016	33	0.02	3
2007		0.01	0.03	0.028	0.04	0.06	0.014	32	0.02	2
2006		0.01	0.03	0.034	0.05	0.05	0.011	30	0.02	3
2005		0.01	0.03	0.032	0.05	0.06	0.014	31	0.02	2
2004		0.01	0.03	*	0.04	0.05	0.010	25	0.02	*
2003		0.01	0.04	0.037	0.05	0.09	0.017	29	0.02	3
2002		0.01	0.03	0.032	0.05	0.07	0.014	30	0.02	2
2001		0.01	0.03	0.034	0.05	0.08	0.015	31	0.02	3
2000		0.01	0.03	0.030	0.04	0.06	0.012	30	0.02	2
1999		0.01	0.03	0.030	0.06	0.07	0.019	26	0.02	2
1998		0.01	0.03	*	0.04	0.05	0.012	27	0.02	*
1997		0.01	0.03	0.030	0.04	0.16	0.026	31	0.02	2
1996		0.01	0.03	0.033	0.06	0.08	0.018	32	0.02	2
1995		0.01	0.03	0.029	0.05	0.14	0.027	32	0.02	2
1994		0.01	0.03	*	0.05	0.10	0.022	22	0.02	*
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.