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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
2024		0.01	0.01	*	0.03	0.04	0.010	17	0.02	*
2023		0.01	0.02	0.022	0.04	0.05	0.012	31	0.02	2
2022		0.01	0.01	0.019	0.03	0.04	0.010	30	0.02	1
2021		0.01	0.02	*	0.04	0.05	0.013	23	0.02	*
2020		0.01	*	*	*	0.04	0.012	9	0.02	*
2019		0.01	0.02	0.024	0.04	0.05	0.012	29	0.02	2
2018		0.01	0.03	0.028	0.04	0.08	0.014	31	0.02	2
2017		0.01	0.03	0.032	0.05	0.06	0.012	29	0.02	2
2016		0.01	0.04	0.040	0.06	0.08	0.018	30	0.02	3
2015		0.01	0.03	0.040	0.06	0.11	0.021	31	0.02	3
2014		0.01	0.03	*	0.06	0.07	0.017	27	0.02	*
2013		0.01	0.02	0.022	0.04	0.06	0.014	30	0.02	2
2012		0.01	0.02	0.024	0.04	0.06	0.012	30	0.02	2
2011		0.01	0.02	0.021	0.04	0.05	0.012	31	0.02	2
2010		0.01	0.03	0.026	0.04	0.06	0.014	30	0.02	2
2009		0.01	0.03	0.033	0.05	0.27	0.045	32	0.02	2
2008		0.01	0.03	0.035	0.05	0.26	0.045	30	0.02	3
2007		0.01	0.02	0.023	0.04	0.05	0.013	31	0.02	2
2006		0.01	0.02	*	0.04	0.05	0.011	26	0.02	*
2005		0.01	0.02	0.025	0.04	0.07	0.016	29	0.02	2
2004		0.01	0.03	0.026	0.04	0.05	0.013	31	0.02	2
2003		0.01	0.03	*	0.05	0.07	0.015	28	0.02	*
2002		0.01	0.03	0.031	0.05	0.11	0.022	31	0.02	2
2001		0.01	0.02	0.020	0.03	0.05	0.011	30	0.02	1
2000		0.01	0.03	0.041	0.05	0.43	0.075	29	0.02	3
1999		0.01	0.02	*	0.06	0.07	0.019	18	0.02	*
1998		0.01	0.02	*	0.04	0.07	0.016	23	0.02	*
1997		0.01	0.02	0.026	0.04	0.06	0.014	27	0.02	2
1996		0.01	0.03	*	0.04	0.05	0.013	26	0.02	*
1995		0.01	0.03	0.033	0.06	0.09	0.021	29	0.02	2
1994		0.01	0.01	0.018	0.03	0.05	0.012	31	0.02	1
1993		0.01	0.01	0.018	0.03	0.03	0.009	31	0.02	1
1992		0.01	0.01	0.020	0.04	0.06	0.014	30	0.02	2
1991		0.01	0.01	0.019	0.03	0.06	0.012	29	0.02	1
1990		0.01	0.01	0.015	0.03	0.04	0.009	31	0.02	1
1989		0.01	0.03	0.028	0.05	0.06	0.014	25	0.02	2

	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.