Question: when was the first world happiness report released
[{'answer': 'April 1 , 2012', 'provenance': [{'wikipedia_id': '42576223', 'title': 'World Happiness Report', 'start_paragraph_id': 7, 'start_character': 49, 'end_paragraph_id': 7, 'end_character': 65, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '42576223', 'title': 'World Happiness Report', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 634, 'bleu_score': 0.9806740509884301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9768878326190573342}, 'section': 'Section::::History.\n'}]}]