Question: when did the massive privatization of russian economy occur
[{'answer': 'in the early and mid-1990s', 'provenance': [{'wikipedia_id': '17845443', 'title': 'Privatization in Russia', 'start_paragraph_id': 1, 'start_character': 236, 'end_paragraph_id': 1, 'end_character': 262, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17845443', 'title': 'Privatization in Russia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 356, 'bleu_score': 0.913499617140693, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3042325401634305806}, 'section': 'Section::::Abstract.'}]}]