user: Question: What's the average total viewers that has 17.6% Share?
Columns: ['Episode No.', 'Airdate', 'Total Viewers', 'Share', 'BBC One Weekly Ranking']
Types: ['real', 'text', 'real', 'text', 'text']
Sample row: [1.0, '28 August 2007', 2715000.0, '18.8%', 'N/A']
SQL:

assistant: SELECT AVG("Total Viewers") FROM "Table" WHERE "Share" = '17.6%';