The estimate also identified 9.0% of the city's population (6.7% of families) below the poverty line, including 11.8% of those under age 18 and 5.2% of those age 65 or over. The largest area of occupation (for civilians aged 16 and older) was in management, business, science, and arts occupations (43.4%), followed by sales and office occupations (28.9%). As of 2010, there were a total of 37,587 housing units in the city (with a density of 1,728.8 per square mile of land), 9.0% of which were vacant. Also as of 2010, 66.0% of the 34,190 total households were family households, 47.7% were husband-wife households, and 28.5% included a child under 18 years. 26.3% of all households were made up of individual householders living alone, and 8.3% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 3.01. A 2012 survey of business owners identified a total of 13,674 companies within the city. An economic census, also from 2012, determined that total retail sales in the city amounted to $1.72 billion. Specific companies with operations in Plantation include DHL (Express Head Office: United States), the University of Phoenix (South Florida Campus), and TradeStation. Companies with former locations in Plantation include American Express (1975 to 2017), and Motorola (1969 to 2015). Plantation was home to two malls, situated across the street from one another: the Westfield Broward Mall (south of Broward Boulevard), and the Fashion Mall (north of Broward Boulevard); however, the Fashion Mall was closed in 2006 and is currently in the process of being re-developed for the Plantation Walk project. The oldest club in the city is the 293 acre Fort Lauderdale Country Club, which was first founded in 1926 (despite setbacks caused by the 1926 Miami hurricane). When first opened, the 6,661 yard course was known as the West Side Golf Course, and was owned by the city of Fort Lauderdale; however, the course was renamed in December 1928 when it was leased by Fort Lauderdale. In 1951, the club was expanded with a second 18-hole, 6,915 yard 'North Course'. Though originally a public club, it became a private club in 1957, when it was sold by the city of Fort Lauderdale.