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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	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		0.0215	0.0215	*	0.11	0.16	0.043	15	0.043	*
2020		0.0215	*	*	*	0.05	0.013	7	0.043	*
2019		0.0215	0.0215	0.034	0.07	0.09	0.021	29	0.043	14
2018		0.03	0.01	*	0.05	0.09	0.021	22	0.02	*
2017		0.03	0.03	0.065	0.18	0.29	0.064	32	0.06	27
2016		0.03	*	0.03	*	0.03	*	28	0.06	12
2015		0.03	*	0.053	*	0.12	*	28	0.06	22
2014		0.03	*	0.04	*	0.07	*	28	0.06	17
2013		0.03	*	0.043	*	0.08	*	28	0.06	18
2012		0.03	*	0.03	*	0.03	*	28	0.06	12
2011		0.03	*	0.03	*	0.03	*	28	0.06	12
2010		0.03	*	0.04	*	0.07	*	27	0.06	17
2009		0.03	*	0.038	*	0.06	*	28	0.06	16
2008		0.03	*	0.058	*	0.11	*	28	0.06	24
2007		0.03	*	0.06	*	0.08	*	27	0.06	25
2006		0.03	*	0.063	*	0.09	*	28	0.06	26
2005		0.08	*	0.12	*	0.16	*	27	0.06	50
2004		0.08	*	0.123	*	0.15	*	28	0.06	51
2003		0.09	*	0.13	*	0.15	*	28	0.06	54
2002		0.03	*	0.123	*	0.25	*	28	0.06	51
2001		0.1	0.1	*	0.1	0.1	0.00	29	0.2	*
2000		0.1	0.1	0.12	0.1	0.3	0.05	30	0.2	50
1999		0.1	0.1	0.10	0.1	0.1	0.00	31	0.2	42
1998		0.1	0.1	*	0.2	0.2	0.04	21	0.2	*
1997		0.1	0.1	*	0.2	0.3	0.06	20	0.2	*
1996		0.1	0.1	0.14	0.2	0.4	0.08	33	0.2	58
1995		0.1	0.3	*	0.6	0.8	0.17	26	0.2	*
1994		0.1	0.3	0.25	0.4	0.7	0.13	37	0.2	103
1993		0.1	0.2	0.25	0.4	1.0	0.17	31	0.2	103
1992		0.1	0.2	0.22	0.4	0.4	0.10	31	0.2	91
1991		0.1	0.3	*	0.6	1.1	0.25	24	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.