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Where can I find historic performance data on Barclays Aggregate Canadian Bond Index?
I couldn't find historical data either, so I contacted Vanguard Canada and Barclays; Vanguard replied that  This index was developed for Vanguard, and thus historical information is available as of the inception of the fund. Unfortunately, that means that the only existing data on historical returns are in the link in your question. Vanguard also sent me a link to the methodology Barclay's uses when constructing this index, which you might find interesting as well.  I haven't heard from Barclays, but I presume the story is the same; even if they've been collecting data on Canadian bonds since before the inception of this index, they probably didn't aggregate it into an index before their contract with Vanguard (and if they did, it might be proprietary and not available free of charge).