The number 17 refers to the 1% population threshold of indigenous people who should be served in their first language. This amounts to 17 languages in Canada. We're currently using 16 languages in our publications on identification and voting. Some information is available in 16 languages. These languages were chosen partly on the basis of population thresholds and partly because of previous requests from some communities.
On March 29th, 2022. See this statement in context.