Question: when did the botswana currency first come into circulation
[{'answer': '1976', 'provenance': [{'wikipedia_id': '544898', 'title': 'Botswana pula', 'start_paragraph_id': 4, 'start_character': 27, 'end_paragraph_id': 4, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '544898', 'title': 'Botswana pula', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12479675788715019637}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '544898', 'title': 'Botswana pula', 'section': 'Section::::Coins.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['1976', 'Following the withdrawal of the 1 and 2 thebe in 1991 and 1998 respectively, smaller 5, 10, 25 and 50 thebe coins were introduced, with the 5 and 25 thebe coins being seven-sided and the 10 and 50 thebe coins remaining round. A bimetallic 5 pula depicting a mopane caterpillar and a branch of the mopane tree it feeds on was introduced in 2000 composed of a cupronickel center in a ring made of aluminium-nickel-bronze. A new series of coins was introduced in 2013. On August 23, 1976, the Bank of Botswana introduced notes in denominations of 1, 2, 5, and 10 pula; a 20-pula', 'Following the withdrawal of the 1 and 2 thebe in 1991 and 1998 respectively, smaller 5, 10, 25 and 50 thebe coins were introduced, with the 5 and 25 thebe coins being seven-sided and the 10 and 50 thebe coins remaining round. A bimetallic 5 pula depicting a mopane caterpillar and a branch of the mopane tree it feeds on was introduced in 2000 composed of a cupronickel center in a ring made of aluminium-nickel-bronze. A new series of coins was introduced in 2013. On August 23, 1976, the Bank of Botswana introduced notes in denominations of 1, 2, 5, and 10 pula; a 20-pula']}}]}, {'provenance': [{'wikipedia_id': '410386', 'title': 'Seretse Khama', 'section': 'Section::::Presidency.\n', 'start_paragraph_id': 22, 'end_paragraph_id': 22, 'meta': {'evidence_span': ['1976', "The government used these revenues to heavily invest in the expansion of infrastructure, health care, and the education system, resulting in further economic development. In particular, the government invested in other sources of economic growth. The cattle industry was heavily subsidized, with the government nationalizing the country's lone slaughterhouse and building two more, heavily subsidizing veterinary services, vaccines, and cattle fence construction. It set up the Botswana Meat Commission as the sole seller of beef in the country, setting prices and selling beef to regional and international markets. With Khama's direct intervention, it negotiated a lucrative trade deal with the European Economic Community, gaining prices far above world levels. The Botswana Development Corporation was established in 1970 to attract foreign investment in crop agriculture, tourism, and secondary industries. In 1976, the Botswana pula was introduced, replacing the"]}}]}, {'provenance': [{'wikipedia_id': '3473778', 'title': 'Common Monetary Area', 'section': 'Section::::Abstract.', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['1976', 'at par with the rand and there is no immediate prospect of change. Foreign exchange regulations and monetary policy throughout the CMA continue to reflect the influence of the South African Reserve Bank. Of the SACU members, only Botswana is currently out of the CMA, having replaced the rand with the pula in 1976. Botswana wanted to implement its own monetary policy and to adjust the exchange rate in case of any future problem in the economy that will affect their economy as well. The CMA, enacted in July 1986, originated from']}}]}, {'provenance': [{'wikipedia_id': '544898', 'title': 'Botswana pula', 'section': 'Section::::History.\n', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['1976', 'The pula was introduced in 1976, replacing the South African rand at par.']}}]}]