With the city having 129,401 households, 108,815 (84.1%) were occupied while 20,586 (15.9%) were not occupied. With 108,815 of the population in households, 3,888 (1.6%) lived in non-institutionalized group-quarters and 2,719 (1.1%) were institutionalized. There were 108,815 households, out of which 23,304 (21.4%) had children under the age of 18 living in them, 37,847 (34.8%) were Marriage living together, 16,425 (15.1%) had a female householder with no husband present, 4,849 (4.5%) had a male householder with no wife present. There were 9,453 (3.9%) unmarried partnerships. 39,397 households (36.2%) were made up of individuals and 28,267 (26.0%) had someone living alone who was 65 years of age or older. The average household size was 2.19. Out of 108,815 occupied households, Family (U.S. Census) made up 59,121 (54.3%) while non-families made up 49,694 (45.7%); the average family size was 2.88. The median age of the city was 41.6 years.. How many percent of households were not vacant?