According to the 2016 American Community Survey, 72.3% of working city of Miami residents commuted by driving alone, 8.7% carpooled, 9% used public transportation, and 3.7% walked. About 1.8% used all other forms of transportation, including taxicab, motorcycle, and bicycle. About 4.5% of working city of Miami residents worked at home. In 2015, 19.9% of city of Miami households were without a car, which decreased to 18.6% in 2016. The national average was 8.7 percent in 2016. Miami averaged 1.24 cars per household in 2016, compared to a national average of 1.8 per household.
Question: How many percentage points of the working Miami population carpooled, used public transportation, or walked?
Answer: 21.4