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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	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		2	*	*	*	13	2.95	10	4.0	*
2001		2	7.5	8.42	12.1	38	6.85	30	4.0	0.3
2000		2	8.5	8.94	12.9	25	4.98	28	4.0	0.3
1999		2	7.5	8.76	16.1	18	4.72	30	4.0	0.3
1998		2	7.0	10.6	19.2	63	11.8	29	4.0	0.4
1997		2	7.5	8.49	15.2	27	5.65	30	4.0	0.3
1996		2	10	10.1	17	22	5.25	28	4.0	0.3
1995		2	9.5	11.0	24.5	37	9.74	30	4.0	0.4
1994		2	13	14.6	24	53	9.54	31	4.0	0.5
1993		4.0	19	20.7	39.4	51	11.7	29	4.0	0.7
1992		7.0	19	25.9	45.3	120	21.3	30	4.0	0.9
1991		10	35	37.7	66.2	79	20.7	28	4.0	1
1990		7.0	23.5	38.4	73.2	140	31.4	30	1.0	1
1989		9.0	42	53.5	91.4	194	35.7	57	1.0	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.