There were 4,280 households of which 32.9% had children under the age of 18 living with them, 39.2% were married couples living together, 16.4% had a female householder with no husband present, 5.7% had a male householder with no wife present, and 38.7% were non-families. 32.0% of all households were made up of individuals and 14% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.90.. How many percent larger is the average family size than household size?