Question: when did the first international earth day occur
[{'answer': '1990', 'provenance': [{'wikipedia_id': '158548', 'title': 'Earth Day', 'start_paragraph_id': 3, 'start_character': 807, 'end_paragraph_id': 3, 'end_character': 811, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '158548', 'title': 'Earth Day', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 847, 'bleu_score': 0.9863473221773311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15785281431186352168}, 'section': 'Section::::Abstract.'}]}]