Participation ratios used to assess member companies are based on the second prior calendar year's voluntary market share. For example, the Facility assessment for the fiscal year ending September 30, 2008, was determined on the basis of 2006 voluntary calendar year writings.

The annual assessment of the incurred Facility loss is based solely on the second previous year's writings to the year of assessment - regardless of the date of loss, policy year or cause of assessment. Corrections and adjustments to a given calendar year's base data, previously reported by the company to its statistical agent, will be accepted for a period of 1 ½ years from the close of the calendar year. For example, companies may submit corrections to calendar year 2006 base data until June 30, 2008.

Second prior year means the second calendar year prior to the year of the assessment. Participation ratio means the ratio of the participating member's Michigan premiums or exposure units to the comparable statewide totals for all participating members.