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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
2025		0.01	0.01	*	0.01	0.01	0.000	20	0.02	*
2024		0.01	0.01	0.010	0.01	0.01	0.000	29	0.02	0.3
2023		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2022		0.01	0.01	0.010	0.01	0.01	0.000	29	0.02	0.3
2021		0.01	0.01	*	0.01	0.01	0.000	22	0.02	*
2020		0.01	*	*	*	0.01	0.000	7	0.02	*
2019		0.01	0.01	*	0.01	0.01	0.000	26	0.02	*
2018		*	*	*	*	*	*	0	*	*
2017		0.01	0.01	*	0.01	0.01	0.000	20	0.02	*
2016		0.01	0.01	0.010	0.01	0.02	0.002	29	0.02	0.3
2015		0.01	0.01	*	0.03	0.04	0.009	25	0.02	*
2014		0.01	0.01	0.013	0.01	0.05	0.011	28	0.02	0.4
2013		0.01	0.01	0.012	0.01	0.04	0.006	31	0.02	0.4
2012		0.01	0.01	0.013	0.01	0.07	0.014	30	0.02	0.4
2011		0.01	0.01	0.014	0.01	0.06	0.012	31	0.02	0.4
2010		0.01	0.01	0.012	0.01	0.03	0.005	31	0.02	0.4
2009		0.01	0.01	*	0.01	0.03	0.004	27	0.02	*
2008		0.01	0.01	0.012	0.01	0.03	0.004	30	0.02	0.4
2007		0.01	0.01	0.013	0.02	0.03	0.006	30	0.02	0.4
2006		0.01	0.01	0.012	0.02	0.04	0.007	29	0.02	0.4
2005		0.01	0.01	0.035	0.04	0.58	0.102	31	0.02	1
2004		0.01	0.01	0.017	0.04	0.06	0.013	30	0.02	0.5
2003		0.01	0.01	0.020	0.04	0.08	0.016	30	0.02	0.6
2002		0.01	0.02	*	0.04	0.04	0.011	26	0.02	*
2001		0.01	0.02	0.031	0.06	0.10	0.024	31	0.02	0.9
2000		0.01	0.03	0.040	0.05	0.35	0.061	30	0.02	1
1999		0.01	0.01	*	0.05	0.06	0.018	27	0.02	*
1998		0.01	0.01	*	0.04	0.05	0.014	15	0.02	*
1997		0.01	*	*	*	0.01	0.073	1	0.02	*
1996		0.01	0.01	0.024	0.03	0.42	0.073	31	0.02	0.7
1995		0.01	0.02	0.018	0.03	0.05	0.011	31	0.02	0.6
1994		0.01	0.01	0.018	0.04	0.08	0.017	31	0.02	0.6
1993		0.01	0.01	0.020	0.03	0.13	0.023	29	0.02	0.6
1992		0.01	0.05	0.074	0.08	0.53	0.100	30	0.02	2
1991		0.03	0.11	0.104	0.16	0.26	0.047	29	0.02	3
1990		0.03	0.11	0.262	0.38	1.5	0.311	27	0.02	8
1989		0.03	0.18	0.246	0.49	0.59	0.169	19	0.02	8

	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.