Question: when did russia join the world economic forum
[{'answer': '1997'}, {'provenance': [{'wikipedia_id': '59755', 'title': 'Group of Eight', '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': 1620467727189229188}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '59755', 'title': 'Group of Eight', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1154, 'bleu_score': 0.864727771164961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1620467727189229188}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5991243', 'title': '25th G8 summit', 'section': 'Section::::Overview.\n', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ["The 25th G8 Summit was held in Cologne, Germany, on June 1820, 1999. The venue for this summit meeting was the Museum Ludwig in the central city. The Group of Seven (G7) was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom, the United States and Canada starting in 1976. The G8, meeting for the first time in 1997, was formed with the addition of Russia. In addition, the President of the European Commission has been formally included in summits since 1981. The summits were not meant to be linked formally with wider international institutions; and in fact, a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France's President Giscard d'Estaing and West Germany's Chancellor Helmut Schmidt as they conceived the initial summit of the Group of Six (G6) in 1975.\rhighlight sentence(s) containing evidence, not only the answer", "The 25th G8 Summit was held in Cologne, Germany, on June 1820, 1999. The venue for this summit meeting was the Museum Ludwig in the central city. The Group of Seven (G7) was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom, the United States and Canada starting in 1976. The G8, meeting for the first time in 1997, was formed with the addition of Russia. In addition, the President of the European Commission has been formally included in summits since 1981. The summits were not meant to be linked formally with wider international institutions; and in fact, a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France's President Giscard d'Estaing and West Germany's Chancellor Helmut Schmidt as they conceived the initial summit of the Group of Six (G6) in 1975."]}}]}, {'provenance': [{'wikipedia_id': '5991423', 'title': '24th G8 summit', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ["The 24th G8 Summit was held in Birmingham, England, United Kingdom on May 1517, 1998. The venue for this summit meeting was the International Convention Centre, Birmingham. The Group of Seven (G7) was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom, the United States and Canada starting in 1976. The G8, meeting for the first time in 1997, was formed with the addition of Russia. In addition, the President of the European Commission has been formally included in summits since 1981. The summits were not meant to be linked formally with wider international institutions; and in fact, a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France's President Giscard d'Estaing and Germany's Chancellor Helmut Schmidt as they conceived the initial summit of the Group of Six (G6) in 1975.\rhighlight sentence(s) containing evidence, not only the answer", "The 24th G8 Summit was held in Birmingham, England, United Kingdom on May 1517, 1998. The venue for this summit meeting was the International Convention Centre, Birmingham. The Group of Seven (G7) was an unofficial forum which brought together the heads of the richest industrialized countries: France, Germany, Italy, Japan, the United Kingdom, the United States and Canada starting in 1976. The G8, meeting for the first time in 1997, was formed with the addition of Russia. In addition, the President of the European Commission has been formally included in summits since 1981. The summits were not meant to be linked formally with wider international institutions; and in fact, a mild rebellion against the stiff formality of other international meetings was a part of the genesis of cooperation between France's President Giscard d'Estaing and Germany's Chancellor Helmut Schmidt as they conceived the initial summit of the Group of Six (G6) in 1975.", 'The G8, meeting for the first time in 1997, was formed with the addition of Russia']}}]}, {'provenance': [{'wikipedia_id': '2530445', 'title': 'Collective Security Treaty Organization', 'section': 'Section::::History.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['and Belarus on 31 December 1993. The treaty came into effect on 20 April 1994. The CST was set to last for a 5-year period unless extended. On 2 April 1999, only six members of the CST signed a protocol renewing the treaty for another five-year period Azerbaijan, Georgia and Uzbekistan refused to sign and withdrew from the treaty instead. At the same time Uzbekistan joined the GUAM group, established in 1997 by Georgia, Ukraine, Azerbaijan, and Moldova, and largely seen as intending to counter Russian influence in the region. Uzbekistan later withdrew from GUAM in 2005 and joined the CSTO in 2006 in order to seek closer ties with Russia. On 28 June 2012, Uzbekistan suspended its membership in the CSTO.\rhighlight sentence(s) containing evidence, not only the answer', 'and Belarus on 31 December 1993. The treaty came into effect on 20 April 1994. The CST was set to last for a 5-year period unless extended. On 2 April 1999, only six members of the CST signed a protocol renewing the treaty for another five-year period Azerbaijan, Georgia and Uzbekistan refused to sign and withdrew from the treaty instead. At the same time Uzbekistan joined the GUAM group, established in 1997 by Georgia, Ukraine, Azerbaijan, and Moldova, and largely seen as intending to counter Russian influence in the region. Uzbekistan later withdrew from GUAM in 2005 and joined the CSTO in 2006 in order to seek closer ties with Russia. On 28 June 2012, Uzbekistan suspended its membership in the CSTO.']}}]}]