It all depends on how many hours you worked. Some people work 5 hours per day. Some work 8 hours per day. And some work maybe 10 hours per day. If you were to take the AVERAGE office worker, working from 9 to 5, that is 8 hours per day inculding their Lunch hour. So, if they were paid for 8 hours per day, that would come to:
8 hours per day x 5 days a week x 52 weeks in one year =2,080 hours per year
$69,280 / 2,080 =~$33.30 per hour.
You can use this type of calculation to figure out the rates per hour for any number of hours that people get paid for.