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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
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		0.15	0.22	*	0.43	0.59	0.131	11	0.05	*
2021		0.08	0.23	*	0.39	0.94	0.173	22	0.05	*
2020		0.16	*	*	*	0.41	0.094	5	0.05	*
2019		0.1	0.22	*	0.5	0.58	0.15	20	0.05	*
2018		0.1	0.2	*	0.44	1.4	0.293	20	0.05	*
2017		0.12	0.25	0.36	0.61	1.0	0.231	29	0.05	94
2016		0.025	0.3	0.339	0.6	0.72	0.178	31	0.05	88
2015		0.12	0.29	0.339	0.6	0.83	0.196	26	0.05	88
2014		0.12	0.27	*	0.57	0.78	0.178	24	0.05	*
2013		0.17	0.35	0.378	0.66	0.82	0.187	31	0.05	98
2012		0.19	0.35	0.415	0.61	1.0	0.189	29	0.05	108
2011		0.17	0.38	0.45	0.89	1.3	0.277	31	0.05	117
2010		0.18	0.33	0.434	0.77	1.2	0.261	29	0.05	113
2009		0.12	0.4	0.499	0.92	1.6	0.326	28	0.05	130
2008		0.21	0.41	0.488	0.81	1.3	0.266	29	0.05	127
2007		0.13	0.39	0.532	0.88	1.4	0.318	23	0.05	138
2006		0.14	0.5	*	0.97	1.5	0.332	25	0.05	*
2005		0.19	0.58	0.722	1.3	1.9	0.449	30	0.05	188
2004		0.28	0.66	0.677	1.0	1.5	0.307	24	0.05	176
2003		0.32	0.75	0.853	1.14	2.8	0.474	29	0.05	222
2002		0.39	0.71	*	1.68	2.0	0.50	23	0.05	*
2001		0.3	0.89	1.03	1.92	2.8	0.679	28	0.05	268
2000		0.4	0.9	1.04	1.6	3.1	0.60	29	0.2	272
1999		0.3	1.3	1.50	2.3	4.0	0.91	23	0.2	390
1998		0.3	1.4	1.36	2.2	2.8	0.64	30	0.2	353
1997		0.3	1.5	*	2.4	4.1	0.88	23	0.2	*
1996		0.25	1.8	1.86	2.7	7.3	1.35	28	0.5	485
1995		0.25	2.2	2.24	3.7	5.0	1.16	31	0.5	582
1994		0.9	2.5	2.45	3.6	5.2	1.06	30	0.5	639
1993		0.25	2.0	2.54	4.1	4.6	1.23	26	0.5	662
1992		1.3	2.9	2.97	4.5	5.2	1.08	31	0.5	774
1991		0.25	2.9	3.25	4.9	6.6	1.64	28	0.5	845
1990		1.5	3.1	3.50	6.2	7.4	1.67	29	0.5	911
1989		1.4	3.4	*	8.7	11	2.70	21	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.