user: Question: How many different index numbers are there for an ozone, running 8 hourly mean of 66-99?
Columns: ['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 )']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '0-33', '0-66', '0-88', '0-11', '0-16']
SQL:

assistant: SELECT COUNT("Index") FROM "Table" WHERE "Ozone, Running 8 hourly mean (μg/m 3 )" = '66-99';