You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
American_Broadcasting_Company

Context:
On the television side, in September 1969, ABC launched the Movie of the Week, a weekly showcase aimed at capitalizing on the growing success of made-for-TV movies since the early 1960s. The Movie of the Week broadcast feature-length dramatic films directed by such talented filmmakers as Aaron Spelling, David Wolper and Steven Spielberg (the latter of whom gained early success through the showcase for his 1971 film Duel) that were produced on an average budget of $400,000–$450,000. Hits for the television network during the late 1960s and early 1970s included The Courtship of Eddie's Father, The Brady Bunch and The Partridge Family.

Question:
When did the Steven Spielberg movie Duel first debut?

1971