Question: when did eric forman leave that 70s show
[{'answer': 'eighth season', 'provenance': [{'wikipedia_id': '1048027', 'title': 'Eric Forman', 'start_paragraph_id': 10, 'start_character': 62, 'end_paragraph_id': 10, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Storylines.:Season eight.\n'}]}, {'provenance': [{'wikipedia_id': '1048027', 'title': 'Eric Forman', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 662, 'bleu_score': 0.983401048538667, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14606505550267004404}, 'section': 'Section::::Storylines.:Season eight.\n'}]}]