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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	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		0.01	0.02	*	0.09	0.11	0.034	15	0.01	*
2013		0.02	0.04	0.055	0.11	0.17	0.038	29	0.01	6
2012		0.01	0.04	0.053	0.10	0.13	0.029	29	0.01	6
2011		0.02	0.05	0.064	0.09	0.26	0.053	27	0.01	7
2010		0.02	0.05	0.054	0.10	0.12	0.031	29	0.01	6
2009		0.02	0.05	0.060	0.12	0.13	0.035	31	0.01	7
2008		0.02	0.05	0.063	0.11	0.18	0.038	30	0.01	7
2007		0.02	0.06	0.083	0.18	0.29	0.064	29	0.01	10
2006		0.02	0.07	0.094	0.16	0.42	0.075	31	0.01	11
2005		0.02	0.09	0.135	0.25	0.39	0.096	29	0.01	16
2004		0.04	0.10	0.151	0.25	0.70	0.135	31	0.01	17
2003		0.04	0.13	*	0.26	0.61	0.137	26	0.01	*
2002		0.04	0.17	0.247	0.47	0.81	0.198	31	0.01	29
2001		0.08	0.24	0.296	0.49	1.1	0.236	30	0.01	34
2000		0.12	0.27	0.368	0.62	1.9	0.348	29	0.01	43
1999		0.03	0.46	*	1.74	2.1	0.605	19	0.01	*
1998		0.04	0.38	0.503	0.80	1.8	0.427	28	0.01	58
1997		0.11	0.34	0.365	0.51	1.2	0.227	29	0.01	42
1996		0.09	0.38	0.440	0.61	1.4	0.230	30	0.01	51
1995		0.03	0.39	0.487	0.91	1.7	0.360	31	0.01	57
1994		0.04	0.42	0.663	1.42	2.1	0.530	29	0.01	77
1993		0.04	0.48	0.620	1.28	1.7	0.472	33	0.01	72
1992		0.11	0.60	0.609	1.01	1.5	0.305	30	0.01	71
1991		0.07	0.60	0.785	1.56	2.4	0.615	29	0.01	91
1990		0.20	0.85	1.19	3.1	5.0	1.09	31	0.01	138
1989		0.15	1.2	*	3.04	5.0	1.37	12	0.01	*

	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.