Seattle City Light 2016 ANNUAL REPORT | Audited Financial Statements 57 THE CITY OF SEATTLE—CITY LIGHT DEPARTMENT NOTES TO FINANCIAL STATEMENTS AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2016 AND 2015 - 57 - Recognition method Non-asymptotic Corridor None Inflation 3.25% Investment Rate of Return 7.50% Post-retirement benefit increases 1.50% Cost-of-living year-end bonus dividend 0.00% Mortality Various rates based on RP-2000 mortality tables and using generational projection of improvement using Projection Scale AA. All other actuarial assumptions used in the December 31, 2015 valuation were based on the results of an actuarial experience study for the period January 1, 2010 through December 31, 2013, including updates to salary increase, mortality and retirement rates. Discount Rate – The discount rate used to measure the total pension liability was 7.50%. The projection of cash flows used to determine the discount rate assumed that plan member contributions will be made at the current contribution rate and the participating governmental entity contributions will be made at rates equal to the difference between actuarially determined contribution rates and the member rate. Based on those assumptions, the pension plan’s fiduciary net position was projected to be available to make all projected future benefit payments of current plan members. Therefore, the long‐term expected rate of return on pension plan investments was applied to all periods on projected benefit payment to determine the total pension liability. The long-term expected rate of return on pension plan investments was determined using a building-block method in which best-estimate ranges of expected future real rates of return (expected returns, net of pension plan investment expense and gross of administrative expenses) are developed for each major asset class. These ranges are combined to produce the long‐term expected rate of return by weighting the expected future real rates of return by the target asset allocation percentage and by adding expected inflation. The following table reflects long-term expected (30 year) real rate of return by asset class. The rate of return was calculated using the capital market assumptions applied to determine the discount rate and asset allocation. The expected inflation rate is projected at 3.25% for the same period.