For those in doubt about Police certificates (PCC) requirement in the last 4 years ... well it still is 4 years.
From the front page of the
updated calculator:
https://eservices.cic.gc.ca/rescalc/resCalcStartNew.do?&lang=en&_ga=2.112683264.544490568.1507686646-665530980.1507686646
Foreign police certificates
You are required to provide a police certificate for each country, other than Canada, where you were present for a
total of 183 days or more during the four (4) years immediately before the date of your application.
For this calculation only, it does not matter if the absence was before or after you became a permanent resident of Canada. Each day spent outside Canada counts as a full day in the other country.
See
How to get a police certificate (police check) for specific and up-to-date information on how to get police certificates from any country.