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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		0.0215	0.0215	*	0.0215	0.07	0.011	26	0.043	*
2023		0.0215	0.0215	0.045	0.08	0.14	0.028	43	0.043	19
2022		0.0215	0.05	0.045	0.08	0.1	0.025	31	0.043	19
2021		0.0215	0.0215	*	0.11	0.14	0.037	23	0.043	*
2020		0.0215	*	*	*	0.06	0.017	8	0.043	*
2019		0.0215	0.0215	0.029	0.05	0.08	0.015	29	0.043	12
2018		0.03	0.01	*	0.08	0.14	0.034	22	0.02	*
2017		0.03	0.03	*	0.09	0.15	0.034	22	0.06	*
2016		0.03	*	*	*	0.06	*	21	0.06	*
2015		0.03	*	0.07	*	0.13	*	28	0.06	29
2014		0.03	*	0.043	*	0.08	*	28	0.06	18
2013		0.03	*	0.03	*	0.03	*	28	0.06	12
2012		0.03	*	0.04	*	0.07	*	28	0.06	17
2011		0.03	*	0.03	*	0.03	*	26	0.06	12
2010		0.03	*	0.038	*	0.06	*	25	0.06	16
2009		0.03	*	0.03	*	0.03	*	28	0.06	12
2008		0.03	*	0.038	*	0.06	*	28	0.06	16
2007		0.03	*	0.03	*	0.03	*	28	0.06	12
2006		0.03	*	0.03	*	0.03	*	28	0.06	12
2005		0.03	*	0.038	*	0.06	*	28	0.06	16
2004		0.03	*	0.03	*	0.03	*	28	0.06	12
2003		0.03	*	0.063	*	0.08	*	27	0.06	26
2002		0.03	*	0.05	*	0.07	*	28	0.06	21
2001		0.1	0.1	*	0.1	0.3	0.05	28	0.2	*
2000		0.1	0.1	0.10	0.1	0.2	0.02	29	0.2	43
1999		0.1	0.1	0.11	0.1	0.3	0.04	29	0.2	44
1998		0.1	0.1	0.10	0.1	0.1	0.00	30	0.2	42
1997		0.1	0.1	0.10	0.1	0.1	0.00	31	0.2	42
1996		0.1	0.1	0.11	0.1	0.2	0.03	28	0.2	44
1995		0.1	0.1	0.20	0.3	0.4	0.11	29	0.2	81
1994		0.1	0.1	0.17	0.3	0.4	0.09	31	0.2	69
1993		0.1	0.2	0.20	0.3	0.4	0.09	29	0.2	82
1992		0.1	0.3	0.24	0.4	0.4	0.11	26	0.2	102
1991		0.1	0.3	*	0.4	0.5	0.11	20	0.2	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

2002 and later data based on quarterly composites; percentiles and standard deviation cannot be determined.
	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.