laundromat vs washette

laundromat

noun
  • A self-service laundry facility with (traditionally) coin-operated (which now may use other per-load payment methods) washing machines, dryers, and sometimes ironing or pressing machines, open to the public for washing clothing and household cloth items. 

washette

noun
  • Synonym of laundromat 

How often have the words laundromat and washette occurred in a corpus of books? (source: Google Ngram Viewer )