In what year did the historical film drama based on the true story of Charles Horman win The Palme d'Or?
1982 Cannes Film Festival: The 35th Cannes Film Festival was held from 14 to 26 May 1982. 1982 Cannes Film Festival:  The Palme d'Or was jointly awarded to "Missing" by Costa Gavras and "Yol" by Şerif Gören and Yılmaz Güney.
i don't know