Question: when did world book day start in the uk
[{'answer': '1995', 'provenance': [{'wikipedia_id': '21743408', 'title': 'World Book Day (UK and Ireland)', 'start_paragraph_id': 1, 'start_character': 275, 'end_paragraph_id': 1, 'end_character': 279, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21743408', 'title': 'World Book Day (UK and Ireland)', 'start_paragraph_id': 2, 'start_character': 10, 'end_paragraph_id': 2, 'end_character': 399, 'bleu_score': 0.5287954324785721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2857024911656661092}, 'section': 'Section::::Abstract.'}]}]