Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average number of House of Representatives seats had an abbreviation of d66?

### Inputs:
table_name: table, columns: ['Abbr.', 'Political Leader', 'International Affiliation', 'Votes ( 2012 )', 'House of Rep. seats', 'Senate seats', 'European Parliament seats']

### Response:
SELECT AVG House of Rep. seats FROM table WHERE Abbr. = d66