Task: Question Understanding
Input (English): Passage: According to the 2016 American Community Survey, 78.1% of working Nashville residents commuted by driving alone, 9.8% carpooled, 2% used public transportation, and 2.2% walked. About 1.1% used all other forms of transportation, including taxicab, motorcycle, and bicycle. About 6.7% of working Nashville residents worked at home. In 2015, 7.9% of city of Nashville households were without a car; this figure decreased to 5.9% in 2016. The national average was 8.7 percent in 2016. Nashville averaged 1.72 cars per household in 2016, compared to a national average of 1.8 per household.
Question: Which year did more Nashville households not have a car, 2015 or 2016?
Output (English): date