Look at your own website, the 'marks' you put up there show consistent improvement in the period you are talking about with the exception of one month, June and that followed a 9% (!) improvement in May.
This is not the proper place to have this conversation, Mike. You can answer queries without blatantly puffing up Oxford, it is advertising. These 'statistics' are inconsistent to say the least and have been the subject of at least three complaints to the Advertising Standards Authority in the recent past. More will follow if you keep on.