Task: Question Generation
Input (English): Passage: As of the census of 2000, there were 49,129 people, 18,878 households, and 13,629 families residing in the county.  The population density was 88 people per square mile (34/km2).  There were 21,779 housing units at an average density of 39 per square mile (15/km2).  The racial makeup of the county was 74.4% Race (United States Census), 20.4% Race (United States Census) or Race (United States Census), 0.60% Race (United States Census), 1.1% Race (United States Census), 0.15% Race (United States Census), 1.3% from Race (United States Census), and 2.2% from two or more races.  3.4% of the population were Race (United States Census) or Race (United States Census) of any race. 2.85% of the population reported speaking Spanish language at home, while 1.51% speak German language.
Output (English): Which groups are between 13000 and 19000?