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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	*	*
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	0.02	*	0.03	0.04	0.009	17	0.02	*
2009		0.01	0.02	0.022	0.04	0.06	0.015	31	0.02	2
2008		0.01	0.02	0.021	0.04	0.06	0.013	31	0.02	2
2007		0.01	0.02	0.022	0.04	0.07	0.014	30	0.02	2
2006		0.01	0.02	0.024	0.04	0.05	0.012	29	0.02	2
2005		0.01	0.03	*	0.04	0.04	0.011	28	0.02	*
2004		0.01	0.02	0.022	0.04	0.06	0.013	30	0.02	2
2003		0.01	0.03	0.033	0.05	0.07	0.015	30	0.02	3
2002		0.01	0.03	0.030	0.04	0.05	0.011	28	0.02	2
2001		0.01	0.03	0.029	0.05	0.06	0.015	30	0.02	2
2000		0.01	0.03	0.035	0.05	0.11	0.024	29	0.02	3
1999		0.01	0.03	*	0.04	0.05	0.013	23	0.02	*
1998		0.01	0.03	*	0.06	0.07	0.017	28	0.02	*
1997		0.01	0.02	*	0.05	0.05	0.015	13	0.02	*
1996		0.01	0.03	0.030	0.05	0.10	0.021	31	0.02	2
1995		0.01	0.03	0.031	0.06	0.10	0.024	30	0.02	2
1994		0.01	0.01	0.017	0.03	0.06	0.014	30	0.02	1
1993		0.01	0.03	0.032	0.06	0.12	0.026	30	0.02	2
1992		0.01	0.01	0.021	0.04	0.07	0.015	30	0.02	2
1991		0.01	0.01	0.025	0.05	0.08	0.022	30	0.02	2
1990		0.01	0.01	0.021	0.04	0.05	0.013	30	0.02	2
1989		0.01	0.03	0.028	0.05	0.07	0.018	23	0.02	2

	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.