Task: Question Understanding
Input (English): Passage: As of the census of 2008, there were 14,957 people. In 2000 there were an estimated 5,205 households and 3,659 families residing in the county. The population density was 20 people per square mile (8/km²).  There were 7,362 housing units at an average density of 10 per square mile (4/km²). The racial makeup of the county was 88.80% Race (United States Census), 8.98% Race (United States Census) or Race (United States Census), 0.46% Race (United States Census), 0.25% Race (United States Census), 0.03% Race (United States Census), 0.45% from Race (United States Census), and 1.03% from two or more races. 1.80% of the population were Race (United States Census) or Race (United States Census) of any race.  In terms of ancestry, 39.7% were English people, 15.2% were Irish people, 14.7% were Americans, and 5.2% were Germans.
Question: How many more was the population density than the housing unit density?
Output (English): number