CREATE TABLE table_40788 ("Abbr." TEXT, "Political Leader" TEXT, "International Affiliation" TEXT, "Votes  (  2012  ) " TEXT, "House of Rep. seats" FLOAT, "Senate seats" FLOAT, "European Parliament seats" FLOAT)

What is the average number of House of Representatives seats had an abbreviation of d66?
SELECT AVG("House of Rep. seats") FROM table_40788 WHERE "Abbr." = 'd66'
SELECT AVG("House of Rep. seats") FROM "table_40788" WHERE "Abbr." = 'd66'