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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		0.75	3.9	*	7.1	9.2	2.25	24	1.5	*
2010		0.75	4.1	*	310	570	155	21	1.5	*
2009		0.75	4.1	4.99	7.4	14	3.12	33	1.5	0.2
2008		*	*	*	*	*	*	0	*	*
2007		1.7	6.3	*	12	26	5.68	16	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1.5	*	*	*	13	3.90	7	3.0	*
2002		1.5	7.0	6.52	9.4	17	3.49	29	3.0	0.2
2001		2	6.0	6.64	11	16	3.93	32	4.0	0.2
2000		2	6.0	6.42	11	15	3.64	29	4.0	0.2
1999		2	5.0	*	10.2	17	3.97	25	4.0	*
1998		2	7.0	9.17	17.5	52	10.1	26	4.0	0.3
1997		2	6.0	7.61	13.1	22	4.80	30	4.0	0.3
1996		2	6.0	6.79	13.2	29	6.13	29	4.0	0.2
1995		2	6.0	7.77	13	31	6.28	31	4.0	0.3
1994		2	7.0	*	13	18	4.07	25	4.0	*
1993		2	12	14.0	30.2	32	9.08	29	4.0	0.5
1992		2	14	19.5	33	78	19.5	31	4.0	0.7
1991		6.0	22	*	62.6	80	20.4	25	4.0	*
1990		0.5	22	*	69.5	120	29.0	26	1.0	*
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.