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:
Washington_University_in_St._Louis

Context:
Olin has a network of more than 16,000 alumni worldwide. Over the last several years, the school’s endowment has increased to $213 million (2004) and annual gifts average $12 million per year.[citation needed] Simon Hall was opened in 1986 after a donation from John E. Simon. On May 2, 2014, the $90 million conjoined Knight and Bauer Halls were dedicated, following a $15 million gift from Charles F. Knight and Joanne Knight and a $10 million gift from George and Carol Bauer through the Bauer Foundation.

Question:
When was Simon Hall opened?

1986