Rates get reviewed alongside the rest of the municipal budget each year, so an increase confirmed for one year does not tell you what the next year will bring, and a figure quoted from an earlier year can already be stale by the time you read it.
For a buyer, utility costs are one part of the carrying cost of a specific house, alongside property tax on the City of Saskatoon's assessed value and normal maintenance, and none of those numbers are safely estimated from a citywide average applied to one address.
A hand-reviewed look at a specific property is the only way to see its full real carrying cost rather than a citywide guess. Get your hand-reviewed valuation from Joel Dyck.