The average number of residents per living room was 0.59 which is about equal to the cantonal average of 0.58 per room. In this case, a room is defined as space of a housing unit of at least  as normal bedrooms, dining rooms, living rooms, kitchens and habitable cellars and attics. About 10.5% of the total households were owner occupied, or in other words did not pay rent (though they may have a Mortgage loan or a rent-to-own agreement). , there were 86,371 private households in the municipality, and an average of 1.8 persons per household.  There were 44,469 households that consist of only one person and 2,842 households with five or more people.  Out of a total of 88,646 households that answered this question, 50.2% were households made up of just one person and there were 451 adults who lived with their parents.  Of the rest of the households, there are 20,472 married couples without children, 14,554 married couples with children There were 4,318 single parents with a child or children.  There were 2,107 households that were made up of unrelated people and 2,275 households that were made up of some sort of institution or another collective housing.
Question: How many more households were made up of collective-type housing than households made up of unrelated people?
Answer: 168