One great way to strip out all the differences in types of home, statistical variations, etc, is to compare the price of a house to the earlier sale of that same house. Granted this isn't perfect either, as the house could have been improved (renovated, etc) in that time period. But it also could have become more worn out/dilapidated/no orange shag carpet hasn't come back.
National Bank/Teranet keep an index of house prices using this method. It can be found at this link:
http://www.housepriceindex.ca/Default.aspx and then click on Calgary. It shows the most recent month being up 8.27% from last year, but they only have data up to June so far.
Michael