How many attempts to assassinate a Canadian prime minister?

There have been a few notable attempts to assassinate Canadian Prime Ministers, with the most significant being the plot against Prime Minister Pierre Trudeau in 1970, during the October Crisis, where members of the Front de libération du Québec (FLQ) kidnapped and threatened him. Another attempt was the assassination of Prime Minister Robert Borden in 1911, which was ultimately unsuccessful. Overall, such attempts have been rare in Canadian history.