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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		0.08	*	*	*	0.08	0.008	1	0.02	*
2011		0.07	0.09	0.087	0.10	0.10	0.008	30	0.02	67
2010		0.06	0.09	0.088	0.10	0.10	0.009	29	0.02	67
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		0.08	*	*	*	0.09	0.006	3	0.02	*
2003		0.08	0.10	0.097	0.11	0.12	0.011	31	0.02	75
2002		0.07	0.09	0.089	0.10	0.11	0.011	31	0.02	68
2001		0.06	0.09	0.086	0.09	0.12	0.010	30	0.02	66
2000		0.08	0.09	0.095	0.11	0.14	0.015	30	0.02	73
1999		0.08	0.08	*	0.08	0.09	0.003	12	0.02	*
1998		0.11	0.13	*	0.15	0.17	0.017	15	0.02	*
1997		0.07	0.11	*	0.12	0.12	0.013	21	0.02	*
1996		0.06	0.08	0.078	0.09	0.11	0.010	31	0.02	60
1995		0.07	0.10	0.099	0.11	0.12	0.011	30	0.02	76
1994		0.05	0.11	*	0.12	0.13	0.020	20	0.02	*
1993		0.08	0.11	0.108	0.13	0.15	0.016	26	0.02	83
1992		0.08	0.11	*	0.13	0.14	0.012	21	0.02	*
1991		0.10	0.12	0.122	0.13	0.15	0.012	30	0.02	94
1990		0.12	0.13	*	0.14	0.14	0.007	24	0.02	*
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.