Persons of National Historic Significance are people designated by the Canadian government as being nationally significant in the history of the country. Approximately 70 nominations are submitted to the Historic Sites and Monuments Board of Canada each year. Désignations are made by the Minister of the Environment on the recommendation of the Monuments Board of Canada. A person is eligible for nomination 25 years after death, though Prime Ministers may be designated any time after death. The program is administered by Parks Canada. Federal plaques are commonly erected to commemorate each person and are installed and maintained by Parks Canada. The intent is to honour the person's contribution to the country and to educate the public about the person.