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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		0.12	0.32	*	2.33	10	2.38	20	0.1	*
2022		0.11	0.41	1.06	1.4	11	2.73	29	0.1	11
2021		0.05	0.15	*	0.62	7.2	1.50	22	0.1	*
2020		0.05	*	*	*	0.24	0.071	7	0.1	*
2019		0.05	0.16	*	0.62	1.4	0.318	26	0.1	*
2018		*	*	*	*	*	*	0	*	*
2017		0.17	1.85	*	55.1	110	32.0	20	0.1	*
2016		0.79	26.5	48.2	130	190	53.9	30	0.1	477
2015		0.05	0.81	*	3.68	7.5	1.84	25	0.1	*
2014		0.11	0.49	1.49	3.83	14	2.77	28	0.1	15
2013		0.16	0.69	1.33	3.0	8.1	1.72	31	0.1	13
2012		0.05	0.46	2.41	8.92	21	4.54	30	0.1	24
2011		0.05	0.3	1.43	1.9	15	2.80	31	0.1	14
2010		0.05	0.47	2.65	9.4	17	4.60	31	0.1	26
2009		0.05	0.15	*	0.34	0.76	0.171	27	0.1	*
2008		0.05	0.17	0.202	0.32	0.78	0.138	30	0.1	2
2007		0.05	0.17	0.193	0.28	0.5	0.085	30	0.1	2
2006		0.05	0.16	0.18	0.26	0.58	0.11	29	0.1	2
2005		0.05	0.18	0.301	0.45	3.4	0.59	31	0.1	3
2004		0.05	0.24	0.291	0.48	1.3	0.24	29	0.1	3
2003		0.05	0.32	0.447	1.07	1.8	0.484	30	0.1	4
2002		0.1	0.24	*	0.97	1.4	0.36	26	0.1	*
2001		0.5	0.27	0.437	0.75	1.0	0.247	31	0.1	4
2000		0.5	0.5	0.69	0.5	3.6	0.58	30	1.0	7
1999		0.5	0.5	0.58	0.5	1.4	0.24	26	1.0	6
1998		0.5	0.5	*	1.1	7.2	1.72	15	1.0	*
1997		0.5	*	*	*	0.5	0.94	1	1.0	*
1996		0.5	0.5	0.83	1.3	5.6	0.94	31	1.0	8
1995		0.5	0.5	0.98	1.8	2.1	0.58	31	1.0	10
1994		0.5	0.5	0.93	1.8	2.5	0.62	31	1.0	9
1993		0.5	0.5	1.10	2.1	3.7	0.87	29	1.0	11
1992		0.5	0.5	0.60	0.5	2.2	0.33	30	1.0	6
1991		0.5	0.5	0.69	1.3	1.9	0.42	29	1.0	7
1990		0.5	1.2	*	2.3	4.2	0.97	24	1.0	*
1989		0.5	0.5	0.91	1.8	2.3	0.57	24	1.0	9

	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.