Thanks to the good people at Archive.org for making available a copy of the National Council of Welfare (NCoW) page, as it was last seen on June 18, 2012.
The linked tables show the average income of social assistance beneficiaries by household type and province / territory of residence, expressed in constant (2011) dollars. The sums apparently include all applicable social transfers to each household type, not just provincial social assistance. For more information, readers may wish to consult Welfare Incomes 2009.
Will update if/when beneficiary count data by province and territory is available.