Since 1867, how many Prime Ministers have served at least a four-year term in office?

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As of 2021, there have been 23 Prime Ministers of Canada since Confederation in 1867. Out of those, only 13 Prime Ministers have served at least a four-year term in office. These 13 Prime Ministers are Sir John A. Macdonald, Alexander Mackenzie, Sir John Abbott, Sir Mackenzie Bowell, Sir Wilfrid Laurier, Sir Robert Borden, William Lyon Mackenzie King, Louis St. Laurent, John Diefenbaker, Lester B. Pearson, Pierre Trudeau, Brian Mulroney, and Stephen Harper.

Since 1867, How Many Prime Ministers Have Served at Least