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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		0.01	0.01	*	0.01	0.01	0.000	12	0.02	*
2011		0.01	0.01	0.010	0.01	0.02	0.002	30	0.02	0.3
2010		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2009		0.01	0.01	0.010	0.01	0.01	0.000	31	0.02	0.3
2008		0.01	0.01	0.010	0.01	0.01	0.000	31	0.02	0.3
2007		0.01	0.01	0.011	0.01	0.03	0.004	29	0.02	0.3
2006		0.01	0.01	0.010	0.01	0.01	0.000	30	0.02	0.3
2005		0.01	0.01	0.034	0.01	0.87	0.154	31	0.02	1
2004		0.01	0.01	0.011	0.01	0.02	0.003	30	0.02	0.3
2003		0.01	0.01	0.012	0.02	0.03	0.005	31	0.02	0.4
2002		0.01	0.01	0.016	0.04	0.05	0.013	30	0.02	0.5
2001		0.01	0.01	0.017	0.03	0.04	0.009	31	0.02	0.5
2000		0.01	0.02	*	0.06	0.18	0.038	24	0.02	*
1999		0.01	0.01	*	0.04	0.05	0.013	18	0.02	*
1998		0.01	0.01	*	0.02	0.23	0.041	28	0.02	*
1997		0.01	0.01	*	0.02	0.04	0.008	28	0.02	*
1996		0.01	0.01	0.023	0.05	0.14	0.026	31	0.02	0.7
1995		0.01	0.01	0.018	0.03	0.07	0.014	30	0.02	0.5
1994		0.01	0.01	0.011	0.01	0.06	0.009	31	0.02	0.3
1993		0.01	0.01	0.013	0.02	0.03	0.006	30	0.02	0.4
1992		0.01	0.01	*	0.01	0.01	0.000	16	0.02	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
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.