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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		0.01	0.01	*	0.01	0.04	0.008	11	0.02	*
2021		0.01	0.01	*	0.01	0.01	0.000	22	0.02	*
2020		0.01	*	*	*	0.01	0.000	5	0.02	*
2019		0.01	0.01	*	0.01	0.03	0.004	20	0.02	*
2018		0.01	0.01	*	0.01	0.02	0.003	20	0.02	*
2017		0.01	0.01	0.010	0.01	0.01	0.000	29	0.02	0.3
2016		0.01	0.01	0.013	0.02	0.04	0.007	31	0.02	0.4
2015		0.01	0.01	0.019	0.03	0.13	0.026	26	0.02	0.6
2014		0.01	0.03	*	0.08	0.12	0.030	24	0.02	*
2013		0.01	0.02	0.030	0.06	0.12	0.027	31	0.02	0.9
2012		0.01	0.01	0.024	0.05	0.19	0.035	29	0.02	0.7
2011		0.01	0.02	0.042	0.06	0.75	0.132	31	0.02	1
2010		0.01	0.02	0.036	0.07	0.22	0.042	29	0.02	1
2009		0.01	0.01	0.029	0.05	0.18	0.034	29	0.02	0.9
2008		0.01	0.02	0.028	0.07	0.07	0.022	29	0.02	0.9
2007		0.01	0.04	0.042	0.06	0.10	0.021	23	0.02	1
2006		0.01	0.03	*	0.07	0.10	0.024	25	0.02	*
2005		0.01	0.05	0.053	0.06	0.28	0.050	30	0.02	2
2004		0.01	0.04	0.040	0.06	0.08	0.016	24	0.02	1
2003		0.01	0.03	0.035	0.06	0.10	0.023	29	0.02	1
2002		0.01	0.03	*	0.07	0.08	0.021	23	0.02	*
2001		0.01	0.28	0.314	0.55	1.7	0.356	28	0.02	10
2000		0.03	0.34	0.379	0.81	0.91	0.271	29	0.02	12
1999		0.01	0.16	*	1.02	3.3	0.770	19	0.02	*
1998		0.01	0.15	0.195	0.35	1.3	0.244	29	0.02	6
1997		0.01	0.17	*	0.41	0.59	0.149	22	0.02	*
1996		0.01	0.11	0.173	0.45	0.62	0.162	28	0.02	5
1995		0.02	0.15	0.270	0.53	2.4	0.432	31	0.02	8
1994		0.01	0.13	0.504	0.33	8.7	1.59	29	0.02	15
1993		0.01	0.15	0.165	0.32	0.83	0.172	26	0.02	5
1992		0.07	0.32	0.370	0.59	1.3	0.234	31	0.02	11
1991		0.03	0.14	0.228	0.48	0.79	0.186	28	0.02	7
1990		0.03	0.11	0.130	0.22	0.68	0.126	28	0.02	4
1989		0.09	0.20	*	0.47	1.0	0.210	21	0.02	*

	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.