How many different index numbers are there for an ozone, running 8 hourly mean of 66-99?
{'header': ['Index', 'Ozone, Running 8 hourly mean (μg/m 3 )', 'Nitrogen Dioxide, Hourly mean (μg/m 3 )', 'Sulphur Dioxide, 15 minute mean (μg/m 3 )', 'PM10 Particles, 24 hour mean (μg/m 3 )', 'PM2.5 Particles, 24 hour mean (μg/m 3 )'], 'page_title': 'Air quality index', 'page_id': '', 'types': ['real', 'text', 'text', 'text', 'text', 'text'], 'id': '1-1942366-7', 'section_title': 'United Kingdom', 'caption': 'United Kingdom', 'rows': [['1', '0-33', '0-66', '0-88', '0-11', '0-16'], ['2', '34-65', '67-133', '89-176', '12-23', '17-33'], ['3', '66-99', '134-199', '177-265', '24-34', '34-49'], ['4', '100-120', '200-267', '266-354', '35-41', '50-58'], ['5', '121-140', '268-334', '355-442', '42-46', '59-66'], ['6', '141-159', '335-399', '443-531', '47-52', '67-74'], ['7', '160-187', '400-467', '530-708', '53-58', '75-83'], ['8', '188-213', '468-534', '709-886', '59-64', '84-91'], ['9', '214-239', '535-599', '887-1063', '65-69', '92-99']], 'name': 'table_1942366_7'}