Premium rate indices are calculated based on data from 51 jurisdictions, for rates in effect as of Jan. 1, 2014. The 2014 median value is $1.85, which is a drop of 2 percent from the $1.88 median of the 2012 study. Oregon’s premium rate index is $1.37 per $100 of payroll, or 74 percent of the national median. National premium rate indices range from a low of $0.88 in North Dakota, to a high of $3.48 in California.
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