This is the latest chart (a cumulative epidemic curve) for my MERS-CoV page
Its a lacking some cases (57 of approx 64 cases are depicted below) - you may have head, data are sometimes hard to come by for the MERS-CoV outbreak. Still, it gives one a clear idea of where most of the cases have been occurring and how quickly they have accumulated.
Of particular interest is the take-off point which occurred from the week beginning April 14th. Over 30 of KSA's reported cases ~49 cases occurred from this point onwards - the exponential part of the red line.