* Non-farm payrolls are expected to have increased by 230,000 in June, with the unemployment rate declining to 5.4 percent from 5.5 percent. * The number of Americans filing new claims for unemployment benefits is expected to have dropped a bit to a seasonally adjusted 270,000. * The Labor Department’s closely watched report, normally issued on a Friday, will be released on Thursday at 8:30 a.m ET because of the Independence Day holiday.