Google Trends web search data for Canada shows, since 2004, the popularity of various genealogy terms, starting with Ancestry and recognizing that it’s not necessarily referring to ancestry.com or ancestry.ca. 
The first jump up starts in December 2009, the second and most prominent in November 2013, then December 2016 and another major jump starting in November 2017. There’s a sawtooth decline with peaks at the end of the year. It’s no surprise that May to October is the (relatively) quietiest time of the year.
Do you know what happened in November 2013, specifically early in the month? What happened in November 2017?
MyHeritage, FamilySearch and Findmypast have nothing like the search volume for Ancestry in Canada.
For most of the period from 2004 FamilySearch leads the pack with a bump in hits in 2015. What caused that big bump?
MyHeritage vies with FamilySearch from 2018 and with three major spikes. Findmypast trails, but the picture is different in the UK where it’s unique collections mean it leads the other two, since 2009.