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1999 IMRF Comprehensive Annual Financial Report

1999 IMRF Comprehensive Annual Financial Report

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Derivation of Experience Gain (Loss)Type of Risk Area <strong>1999</strong> 1998Risks Related to Assumptionsin millionsActuarial SectionEconomic Risk AreasInvestment Return $962.1 $515.7Pay Increases 5.5 (69.9)Demographic Risk AreasService Retirements 6.8 37.8Early Retirements (5.1) (8.7)Vested Deferred Retirements (14.6) 37.8Death and Survivor Benefits 0.6 7.7Disability Benefits 6.4 5.7Terminated with Refund (21.1) 10.5Risks Not Related to Assumptions (168.1)* (197.0)Total Gain (or Loss) During Year $758.9 $318.6Regular actuarial valuations give information about the composite change in unfunded actuarial accrued liabilities—whether or not the liabilities are increasing or decreasing and by how much. The objective of a gain and lossanalysis is to determine the portion of the change in actuarial condition (unfunded actuarial accrued liabilities)attributable to each risk area. The fact that actual experience differs from assumed experience is to be expected—the future cannot be predicted with 100 percent precision. The economic risk areas (investment return and payincreases) are volatile. It is assumed that gains and losses will be in balance over a period of years, but sizableyear-to-year fluctuations are common.*Including $166.6 million from experience studyIllinois Municipal Retirement Fund 59

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