A Statistics Canada report has found that international migration remains the principal source of population growth in census metropolitan areas (CMAs), particularly in Western Canada.

2. A Statistics Canada report has found that international migration
remains the principal source of population growth in census
metropolitan areas (CMAs), particularly in Western Canada. The
study covers the years 2014/2015. While immigration was the
source of 60% of population growth in CMAs, its contribution was
down from 2013/2014 (66%). Statistics Canada estimates indicate
that the seven CMAs with the highest relative rate of population
growth were all located in Western Canada. Of these, Kelowna
(+3.1%) and Abbotsford-Mission (+1.4%) are located in British
Columbia; Calgary and Edmonton (both +2.4%) are in Alberta;
Saskatoon (+2%) and Regina (+1.9%) are in Saskatchewan; and
Winnipeg (+1.4%) is in Manitoba.