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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	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		0.14	*	*	*	0.14	0.053	1	0.1	*
2011		0.05	0.05	0.095	0.17	0.2	0.053	30	0.1	0.9
2010		0.05	0.05	0.087	0.18	0.25	0.063	30	0.1	0.9
2009		0.05	0.12	0.141	0.25	0.67	0.133	32	0.1	1
2008		0.05	0.05	0.113	0.25	0.27	0.077	31	0.1	1
2007		0.05	0.11	0.118	0.26	0.4	0.096	29	0.1	1
2006		0.05	0.13	0.142	0.22	0.34	0.071	31	0.1	1
2005		0.05	0.15	0.146	0.29	0.38	0.094	34	0.1	1
2004		0.05	0.12	0.135	0.29	0.37	0.098	30	0.1	1
2003		0.05	0.12	0.151	0.29	0.34	0.089	31	0.1	1
2002		0.05	0.19	0.242	0.71	0.82	0.231	31	0.1	2
2001		0.5	0.05	0.266	0.25	0.41	0.192	30	0.1	3
2000		0.5	0.5	0.50	0.5	0.5	0.00	30	1.0	5
1999		0.5	0.5	*	0.5	0.5	0.00	21	1.0	*
1998		0.5	0.5	*	0.5	0.5	0.00	15	1.0	*
1997		0.5	0.5	0.52	0.5	1.3	0.15	29	1.0	5
1996		0.5	0.5	0.50	0.5	0.5	0.00	31	1.0	5
1995		0.5	0.5	0.58	1.1	1.3	0.24	30	1.0	6
1994		0.5	0.5	0.59	0.5	3.1	0.47	31	1.0	6
1993		0.5	0.5	0.69	0.5	4.2	0.70	30	1.0	7
1992		0.5	0.5	0.54	0.5	2.1	0.29	30	1.0	5
1991		0.5	0.5	0.62	0.5	3.3	0.56	30	1.0	6
1990		0.5	0.5	*	1.4	3.7	0.72	24	1.0	*
1989		*	*	*	*	*	*	0	*	*

	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.