Task: Question Answering
Input (English): Passage: As of the census of 2000, there were 445,342 people, 169,162 households, and 114,015 families residing in the county.  The population density was 615 people per square mile (238/km²).  There were 178,913 housing units at an average density of 247 per square mile (95/km²).  The racial makeup of the county was 82.19% Race (United States Census), 1.15% Race (United States Census) or Race (United States Census), 0.65% Race (United States Census), 6.68% Race (United States Census), 0.30% Race (United States Census), 5.86% from Race (United States Census), and 3.17% from two or more races.  11.17% of the population were Race (United States Census) or Race (United States Census) of any race. 17.2% were of German American, 9.9% English American, 8.2% Irish American, and 6.7% Americans ancestry. 81.7% spoke only English at home, while 9.6% spoke Spanish and 1.2% Vietnamese. 
Question: How many more percents of people in the country spoke Spanish at home compared to speaking Vietnamese at home? 
Answer type: Number 
Output (English): 8.4.