user: Question: What is the average number of House of Representatives seats had an abbreviation of D66?
Columns: ['Abbr.', 'Political Leader', 'International Affiliation', 'Votes ( 2012 )', 'House of Rep. seats', 'Senate seats', 'European Parliament seats']
Types: ['text', 'text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['VVD', 'Mark Rutte *', 'Liberal International , ELDR', '2,498,231', 41.0, 16.0, 3.0]
SQL:

assistant: SELECT AVG("House of Rep. seats") FROM "Table" WHERE "Abbr." = 'D66';