Question: Europa was part of a trilogy of films that began with a film released in what year?

Context articles: The Element of Crime
Goldene Zeiten
List of Star Wars films and television series
Epidemic (film)
The Wonderful Lies of Nina Petrovna
Love Marriage (2001 film)
Humko Deewana Kar Gaye
Europa trilogy
Europa (film)
Plaga Zombie (film series)

The Element of Crime is a 1984 Danish neo-noir crime art film co-written and directed by Lars von Trier.
 It is the first feature film directed by Trier and the first installment of the director's Europa trilogy – comprising "Epidemic" (1987) and "Europa" (1991).
Goldene Zeiten is a German film released in 2006.
 It is the last film in director trilogy of films set in his hometown Unna, and was preceded by "Bang Boom Bang" (1999) and "Was nicht passt wird passend gemacht" (2006).
 It did not meet the box office expectations with less than 100,000 viewers in German cinemas ("Bang Boom Bang" attracted 460,000, "Was nicht passt wird passend gemacht" 670,000).
 The film was released on DVD on October 26, 2006, both as a Single DVD and Double DVD Special Edition.
The "Star Wars" films include two complete trilogies: the original trilogy released between 1977 and 1983, and the prequel trilogy released between 1999 and 2005.
 A third trilogy that follows the first two began in 2015.
 Other films have taken or will take place between the trilogy films.
 There have also been several "Star Wars" television series and films, with the first being released in 1978.
Epidemic is a Danish horror film of 1987 directed by Lars von Trier, the second installment of Trier's Europa trilogy.
 The other two films in the trilogy are "The Element of Crime" (1984) and "Europa" (1991).
The Wonderful Lies of Nina Petrovna (German: Die wunderbare Lüge der Nina Petrowna) is a 1929 German silent drama film directed by Hanns Schwarz and starring Brigitte Helm, Francis Lederer and Warwick Ward.
 It was the last big-budget silent film released by the leading German studio Universum Film AG before the transition to sound began with "Melody of the Heart".
 The film premiered on 15 April 1929 at the Ufa-Palast am Zoo in Berlin.
 It was amongst the most popular films released in Germany that year.
Love Marriage is a South Indian Tamil film released in 2001 directed by K. Subash making it his last directorial in Tamil films.
 A remake of the successful Telugu film "Swayamvaram", the film was produced by Vikram Krishna then known as Ajay, who also appeared in the lead role alongside Ranjana.
 The film released on 14 December 2001 to poor reviews from critics.
Humko Deewana Kar Gaye (translation: "You Made Me Crazy") is a 2006 Indian Hindi romantic drama film directed by Raj Kanwar, produced by Raj Kanwar, Bhushan Kumar & Krishan Kumar and starring Akshay Kumar and Katrina Kaif, Bipasha Basu, Anil Kapoor and Manoj Joshi also star in the movie in supporting roles.
 The film is inspired by British romantic movie "Notting Hill".
 The film is produced by the Indian music company, T-Series and Inderjit Films Combine.
 The movie's score and soundtrack is composed by Anu Malik with lyrics by Sameer.
 Himesh Reshammiya rendered a special song for the film which became extremely popular.
 The film released on 14 April 2006.
 The music of the film released on 2 February 2006.
The "Europa" trilogy is a film trilogy written and directed by Lars von Trier, comprising his three feature films "The Element of Crime" (1984), "Epidemic" (1987) and "Europa" (1991).
 The films are not a narrative trilogy, but rather are linked by common themes and stylistic explorations.
 The overarching subject of the trilogy may be taken to be the social crises and traumas of Europe in the future.
 Each of the three films follows a character whose idealistic actions ultimately perpetuate the very problem he seeks to solve.
 Von Trier's later "USA - Land of Opportunities Trilogy" also deals with both apparent social collapse, and the ill-effects of the interventions of idealistic individuals.
 The trilogy also experiments with film noir conventions, and explores hypnosis and the relationship between reality and unreality.
Europa (known as Zentropa in North America) is a 1991 Danish art drama film directed by Lars von Trier.
 It is von Trier's third theatrical feature film and the final film in his Europa trilogy following "The Element of Crime" (1984) and "Epidemic" (1987).
Plaga Zombie is an Argentine comedy horror film series created by Pablo Parés, Berta Muñiz, and Hernán Sáez.
 The films follow three misfit heroes who uncover an alien-government conspiracy after a zombie outbreak occurs in their hometown.
 Plaga Zombie was the first-ever zombie horror film released in Argentina and is the only zombie horror trilogy to be produced in Latin America.