recharts: take a look at the excel chart picture in this post and it will clear up everything http://www.torontocondobubble.com/2013/04/toronto-home-sales-are-lower-than-being.html

MLS usually takes the rented apartments within a day. I dont think his data is flawed, and he mentioned that he crosschecked for duplicates and accounted for posibility of rented apartments. Now if he does a follow up and the numbers are the same, data would be even more reliable