user: Question: What are the original air date(s) for episodes with 8.63 million viewers?
Columns: ['Episode #', 'Production Count', 'Original Airdate', 'Prod. Code', 'Title', 'Viewing Figures Millions']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 7.0, '22 December 2000', 'IPEA340E', '"Christmas"', 'N/A']
SQL:

assistant: SELECT "Original Airdate" FROM "Table" WHERE "Viewing Figures Millions" = '8.63';