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:
Muammar_Gaddafi

Context:
In December 1978, Gaddafi stepped down as Secretary-General of the GPC, announcing his new focus on revolutionary rather than governmental activities; this was part of his new emphasis on separating the apparatus of the revolution from the government. Although no longer in a formal governmental post, he adopted the title of "Leader of the Revolution" and continued as commander-in-chief of the armed forces. He continued exerting considerable influence over Libya, with many critics insisting that the structure of Libya's direct democracy gave him "the freedom to manipulate outcomes".

Question:
In what year did Gaddafi resign from his position in the GPC?

1978