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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
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		0.1	0.23	*	0.84	1.0	0.295	15	0.05	*
2013		0.15	0.27	0.455	1.0	1.5	0.336	29	0.05	118
2012		0.18	0.32	0.425	0.76	1.4	0.26	29	0.05	110
2011		0.2	0.41	0.516	0.89	1.4	0.292	27	0.05	134
2010		0.21	0.4	0.547	1.0	1.4	0.335	29	0.05	142
2009		0.13	0.48	0.587	1.1	1.6	0.389	31	0.05	153
2008		0.23	0.46	0.571	1.1	1.4	0.31	30	0.05	149
2007		0.2	0.45	0.601	1.34	1.7	0.417	29	0.05	156
2006		0.18	0.53	0.689	1.3	2.2	0.478	31	0.05	179
2005		0.2	0.61	0.832	1.76	2.2	0.608	29	0.05	216
2004		0.25	0.67	0.754	1.3	1.6	0.38	31	0.05	196
2003		0.36	0.65	*	1.35	3.1	0.576	26	0.05	*
2002		0.21	0.71	1.01	2.1	2.6	0.656	31	0.05	261
2001		0.39	0.8	1.06	1.9	3.8	0.814	30	0.05	275
2000		0.4	1.1	1.27	2.6	3.0	0.75	29	0.2	329
1999		0.1	1.3	1.64	3.3	4.4	1.12	29	0.2	426
1998		0.1	1.4	1.66	3.1	4.0	0.93	29	0.2	432
1997		0.5	1.4	1.48	2.9	3.9	0.93	30	0.2	385
1996		0.25	1.8	1.91	2.8	7.4	1.26	30	0.5	497
1995		0.25	2.3	2.45	3.7	6.7	1.43	31	0.5	638
1994		0.25	3.2	3.33	4.8	7.7	1.61	29	0.5	867
1993		0.25	2.2	2.63	4.5	5.5	1.33	33	0.5	685
1992		1.0	3.2	3.44	5.6	6.3	1.45	30	0.5	895
1991		0.25	3.4	3.91	7.5	8.4	2.37	29	0.5	1018
1990		2.0	3.9	4.79	8.4	10	2.32	31	0.5	1247
1989		1.7	4.8	*	10.9	11	3.13	12	0.5	*

	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.