Under ideal conditions, a cat scan machine in a local hospital can operate $115$ patients per week $($when there are no no$-$shows, late patients, or mechanical problems. Under real$-$world conditions, the machine can serve $82$ patients per week at most. Last week the machine processed $81$ patients. What is the utilization of effective capacity.

State your answer in percent $($for example $78,$ not $0\mathrm{.}78)$