Shall the Charter of the City of Oakland be amended to authorize the City Council to adopt an ordinance by a 4/5 vote, that would eliminate the costs of administering the Oakland Municipal Employees' Retirement System ("OMERS") by purchasing annuities to pay all retirement benefits due to OMERS retirees and beneficiaries, provided the City holds all remaining OMERS assets in a trust for the benefit of retirees and beneficiaries until all benefits have been paid?