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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		0.68	*	*	*	0.68	0.299	1	0.05	*
2011		0.06	0.21	0.314	0.76	1.2	0.299	30	0.05	82
2010		0.05	0.23	0.26	0.58	0.73	0.195	30	0.05	68
2009		0.05	0.21	0.344	0.81	1.2	0.325	32	0.05	89
2008		0.09	0.24	0.356	0.72	1.0	0.265	31	0.05	93
2007		0.06	0.24	0.374	1.02	1.2	0.367	29	0.05	97
2006		0.05	0.27	0.387	1.0	1.4	0.342	31	0.05	101
2005		0.07	0.32	0.408	1.03	1.5	0.375	34	0.05	106
2004		0.07	0.22	0.403	0.78	1.4	0.35	30	0.05	105
2003		0.1	0.31	0.546	1.2	1.8	0.498	31	0.05	142
2002		0.08	0.27	0.631	1.5	2.2	0.574	31	0.05	164
2001		0.08	0.4	0.61	1.26	3.1	0.672	30	0.05	159
2000		0.1	0.5	0.73	1.9	3.1	0.86	30	0.2	191
1999		0.1	0.5	0.80	1.7	2.9	0.73	31	0.2	207
1998		0.1	0.5	0.83	2.3	2.8	0.83	31	0.2	215
1997		0.1	0.5	1.00	2.4	5.8	1.19	31	0.2	259
1996		0.25	0.25	0.79	1.5	3.1	0.70	33	0.5	206
1995		0.25	1.0	1.24	2.4	4.5	1.11	30	0.5	322
1994		0.25	1.0	1.44	3.1	7.6	1.55	31	0.5	375
1993		0.25	1.2	1.35	3.6	4.4	1.26	30	0.5	352
1992		0.25	1.0	1.34	2.8	3.8	1.05	30	0.5	347
1991		0.25	1.6	2.42	5.4	7.3	2.04	30	0.5	629
1990		0.25	1.3	*	5.2	5.4	1.78	24	0.5	*
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.