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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	*	*
2024		0.0215	0.0215	0.023	0.0215	0.07	0.01	28	0.043	10
2023		0.0215	0.0215	*	0.0215	0.06	0.008	24	0.043	*
2022		0.0215	0.0215	0.035	0.08	0.08	0.022	29	0.043	14
2021		0.0215	0.0215	*	0.08	0.12	0.027	23	0.043	*
2020		0.0215	*	*	*	0.0215	0.00	7	0.043	*
2019		0.0215	0.0215	0.025	0.0215	0.07	0.009	28	0.043	11
2018		0.03	0.01	*	0.03	0.07	0.014	21	0.02	*
2017		0.03	0.03	0.033	0.03	0.1	0.014	29	0.06	14
2016		0.03	*	0.03	*	0.03	*	28	0.06	12
2015		0.03	*	0.03	*	0.03	*	28	0.06	12
2014		0.03	*	0.03	*	0.03	*	28	0.06	12
2013		0.03	*	0.03	*	0.03	*	28	0.06	12
2012		0.03	*	0.03	*	0.03	*	27	0.06	12
2011		0.03	*	0.03	*	0.03	*	28	0.06	12
2010		0.03	*	0.03	*	0.03	*	28	0.06	12
2009		0.03	*	0.03	*	0.03	*	28	0.06	12
2008		0.03	*	0.03	*	0.03	*	28	0.06	12
2007		0.03	*	0.03	*	0.03	*	28	0.06	12
2006		0.03	*	0.045	*	0.06	*	28	0.06	19
2005		0.03	*	0.058	*	0.08	*	28	0.06	24
2004		0.03	*	0.06	*	0.08	*	28	0.06	25
2003		0.03	*	0.053	*	0.09	*	28	0.06	22
2002		0.03	*	0.048	*	0.07	*	28	0.06	20
2001		0.1	0.1	*	0.1	0.1	0.00	28	0.2	*
2000		0.1	0.1	0.10	0.1	0.1	0.00	30	0.2	42
1999		0.1	0.1	0.10	0.1	0.1	0.00	30	0.2	42
1998		0.1	0.1	0.10	0.1	0.1	0.00	32	0.2	42
1997		0.1	0.1	0.10	0.1	0.1	0.00	29	0.2	42
1996		0.1	0.1	0.11	0.1	0.2	0.02	31	0.2	44
1995		0.1	0.2	0.19	0.3	0.4	0.09	30	0.2	80
1994		0.1	0.1	0.13	0.2	0.3	0.05	30	0.2	53
1993		0.1	0.1	*	0.2	0.3	0.06	24	0.2	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
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.