Ontario Teachers' Pension Plan invests and administers the pensions of active and retired teachers. It invests the pension fund's assets and administers the pensions of 284,000 active and retired teachers in Ontario. A pension plan has existed for Ontario teachers since 1917. Today, the plan's members include 173,000 teachers in elementary and secondary schools in Ontario, 111,000 pensioners, and 72,000 inactive members. The plan has one of Canada's largest payrolls with $4.2 billion in benefits paid to plan members and $2.3 billion received in total contributions from teachers and the provincial government in 2008.