Except that-it was not over a decade and was over 55 billion in one year alone. The recession didn't last a decade and anyway .Harper put Canada into deficit before. during and after the recession  and nearly strangled the economy before he was booted, with the slowest growth since RB Bennett.
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Consider also that oil and other commodities were at record highs so that other countries  that relied on the export of commodities such as Australia did well also ,better than Canada.
 Harper encouraged the housing bubble and the petro dollar because his government relied on the  twin towers of the oil price  bubble and the housing  housing bubble.