(Olympia, WA)  --  Washington's unemployment rate is down for the fifth straight month.  The state Employment Security Department says the jobless rate for December was five-point-two percent, the lowest rate since May 2008.  Officials say Washington employers added 67-hundred new jobs last month, up from four-thousand jobs in November.  Private-sector employment increased by 74-hundred jobs, while government employment fell by 700 last month.