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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	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		0.01	0.01	*	0.01	0.01	0.000	17	0.02	*
2009		0.01	0.01	0.010	0.01	0.01	0.000	31	0.02	0.3
2008		0.01	0.01	0.012	0.01	0.04	0.007	31	0.02	0.4
2007		0.01	0.01	0.011	0.01	0.03	0.004	30	0.02	0.3
2006		0.01	0.01	0.011	0.01	0.02	0.003	29	0.02	0.3
2005		0.01	0.01	*	0.02	0.03	0.006	28	0.02	*
2004		0.01	0.01	0.011	0.01	0.03	0.004	30	0.02	0.3
2003		0.01	0.01	0.042	0.05	0.58	0.105	30	0.02	1
2002		0.01	0.01	0.014	0.03	0.04	0.008	28	0.02	0.4
2001		0.01	0.01	0.016	0.03	0.04	0.010	30	0.02	0.5
2000		0.01	0.01	0.020	0.04	0.06	0.014	29	0.02	0.6
1999		0.01	0.01	*	0.03	0.04	0.009	23	0.02	*
1998		0.01	0.01	*	0.02	0.05	0.011	30	0.02	*
1997		0.01	0.01	*	0.01	0.02	0.003	13	0.02	*
1996		0.01	0.01	0.011	0.01	0.03	0.004	31	0.02	0.3
1995		0.01	0.01	0.016	0.03	0.04	0.009	30	0.02	0.5
1994		0.01	0.01	0.013	0.02	0.05	0.009	31	0.02	0.4
1993		0.01	0.01	0.025	0.05	0.14	0.028	30	0.02	0.8
1992		0.01	0.01	0.025	0.05	0.10	0.026	30	0.02	0.8
1991		0.01	0.03	0.034	0.06	0.19	0.038	29	0.02	1
1990		0.01	0.03	0.038	0.06	0.12	0.024	30	0.02	1
1989		0.03	0.10	0.116	0.20	0.32	0.072	23	0.02	4

	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.