user: Question: what is the average attendance per match wheree the elevation is 1500 m?
Columns: ['Stadium', 'City', 'Capacity', 'Matches played', 'Overall attendance', 'Average attendance per match', 'Average attendance as % of Capacity', 'Overall goals scored', 'Average goals scored per match', 'Elevation']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'text', 'real', 'text', 'text']
Sample row: ['Cape Town Stadium', 'Cape Town', 64100.0, 8.0, 507340.0, 63418.0, '98.9', 22.0, '2.75', '0 (sea level)']
SQL:

assistant: SELECT "Average attendance per match" FROM "Table" WHERE "Elevation" = '1500 m';