If you break it down like that it doesn’t sound so bad; however, looking at the big picture, I see a 50% increase in total vacancy rate between 2005 and 2007. Between 1960 and 2005 there was a fairly steady increase in vacancy. Sometime between 2005 and now, there was a vertical jump (the largest since the data begins or 1960).
Jeeze, Prof. Piggington’s got me graphing stuff now! Must… get.. a life!