Question: Edoardo Agnelli's mother was named to the International Best Dressed List Hall of Fame in what year?

Context articles: Guy de Rothschild
Mona von Bismarck
Amanda Harlech
Lee Radziwill
C. Z. Guest
Aimée de Heeren
Jane Engelhard
Marella Agnelli
Edoardo Agnelli
Hope Portocarrero

Baron Guy Édouard Alphonse Paul de Rothschild (] ; 21 May 1909 – 12 June 2007) was a French banker and member of the Rothschild family.
 He owned the bank Rothschild Frères from 1967 to 1979, when it was nationalized by the French government, and maintained possessions in other French and foreign companies including Imerys.
 He was named to the International Best Dressed List Hall of Fame in 1985.
Mona von Bismarck (February 5, 1897 – July 10, 1983), known as Mona Bismarck, was an American socialite, fashion icon, and famed beauty.
 Her five husbands included Harrison Williams, said to be the richest man in America, and the Graf von Bismarck-Schönhausen, grandson of German Chancellor Otto von Bismarck.
 Mona was the first American to be named "The Best Dressed Woman in the World" by a panel of top couturiers including Chanel, and was also named to the International Best Dressed List Hall of Fame.
Amanda Harlech (born Amanda Jane Grieve) is a British creative consultant and writer with a long association with the couturiers John Galliano and Karl Lagerfeld.
 She was named to the International Best Dressed List Hall of Fame in 1997.
Caroline Lee Radziwill ("née" Bouvier, formally Bouvier-Canfield; born March 3, 1933) is an American socialite, public relations executive, interior decorator, and former actress.
 She is the younger sister of the late First Lady, Jacqueline Onassis, and sister-in-law of President John F. Kennedy.
 Her niece Caroline Bouvier Kennedy is named after her.
 Radziwill was named to the International Best Dressed List Hall of Fame in 1996.
 Married and divorced three times, her marriage to her third husband, Herbert Ross, ended in divorce shortly before his death in 2001.
Lucy Douglas "C. Z." Guest ("née" Cochrane; February 19, 1920 - November 8, 2003) was an American stage actress, author, columnist, horsewoman, fashion designer, and socialite who achieved a degree of fame as a fashion icon.
 She was frequently seen wearing elegant designs by famous designers like Mainbocher.
 Her unfussy, clean-cut style was seen as typically American, and she was named to the International Best Dressed List Hall of Fame in 1959.
Aimée de Heeren, born Aimée Soto-Maior de Sá or Aimée de Sotomayor (3 August 1903 – 13 September 2006) was a Brazilian socialite.
 She was named to the International Best Dressed List Hall of Fame in 1996.
Jane Engelhard (August 12, 1917 – February 29, 2004), born Marie Antoinette Jeanne Reiss, was an American philanthropist, best known for her marriage to billionaire industrialist Charles W. Engelhard Jr., as well as her donation of an elaborate 18th-century Neapolitan crêche to the White House in 1967.
 She was named to the International Best Dressed List Hall of Fame in 1972.
Marella Agnelli, born Donna Marella Caracciolo di Castagneto (born 4 May 1927) is an Italian noblewoman, art collector, socialite, style icon and widow of former Fiat chairman Gianni Agnelli.
 She has often appeared in the fashion magazine "Vogue."
 She was named to the International Best Dressed List Hall of Fame in 1963.
Edoardo Agnelli (9 June 1954 – 15 November 2000) was the eldest child and only son of Marella Agnelli (born Donna Marella Caracciolo di Castagneto) and Gianni Agnelli, the industrialist patriarch of Fiat.
 His body was found dead under mysterious circumstances under a bridge on the outskirts of Turin.
Hope Portocarrero, also known as Madame Somoza (June 28, 1929 – 5 October 1991) was the First Lady of Nicaragua, the wife of dictator Anastasio Somoza Debayle and mother of Anastasio Somoza Portocarrero.
 She was named to the International Best Dressed List Hall of Fame in 1968.