It is, more specifically, the number of privacy breach reports that has gone up by a factor of five. That increase is attributable to the coming into effect, on November 1, 2018, of regulation obliging companies to disclose any important privacy breach.
The number of regular investigations following complaints of violations of the Personal Information Protection and Electronic Documents Act, which applies to private sector organizations, has not increased as much.
Now that that regulation is in effect, the annual number of reports should ultimately stabilize over the years.