Who were the last 3 prime ministers before steven Harper?

The last five Prime Ministers of Canada are:

Brian Mulroney: September 17, 1984 - June 24/25, 1993

Kim Campbell: June 25, 1993 - November 3/4, 1993

Jean Chretien: November 4, 1993 - December 11/12, 2003

Paul Martin: December 12, 2003 - February 5/6, 2006

Stephen Harper: February 6, 2006 - present