Question: In what year did the historical film drama based on the true story of Charles Horman win The Palme d'Or?

Related documents: [0]  [DOC] Missing (stylized as missing.) is a 1982 American historical drama film directed by Costa-Gavras and starring Sissy Spacek, Jack Lemmon, Melanie Mayron, John Shea, Janice Rule and Charles Cioffi. It is based on the true story of American journalist Charles Horman, who disappeared in the bloody aftermath of the US-backed Chilean coup of 1973 that deposed the democratically elected socialist President Salvador Allende. Set largely during the days and weeks following Horman's disappearance, the movie depicts his father and wife searching to determine his fate. The film examines the relationship between Horman's wife Beth (Spacek) and her father-in-law, American businessman Ed Horman (Lemmon). [END] 
[1]  [DOC] The 35th Cannes Film Festival was held from 14 to 26 May 1982. The Palme d'Or was jointly awarded to "Missing" by Costa Gavras and "Yol" by Şerif Gören and Yılmaz Güney. [END]  
Answer: 1982
1982