Detailed Instructions: Given a question and its paraphrases, answer the question. The answer should exactly answer all the questions given without any ambiguity. Don't give partial answers.
Q: Questions: ['when did guyana join the commonwealth of nations?', 'when did guyana join the common wealth of nations?', 'which month did guyana join commonwealth?', 'on what day did guyana join the commonwealth of nation?', 'when did guyana become a member of the commonwealth nations?', 'when did guyana join the commonwealth of nations?']
A:
1966