There are 186,440 people (up from 181,743 in 2000), 75,177 households, and 57,543 families residing in the city. This amounts to 6.75% of Utahs population, 18.11% of Salt Lake Countys population, and 16.58% of the new Salt Lake metropolitan population. The area within the city limits covers 14.2% of Salt Lake County. Salt Lake City is more densely populated than the surrounding metro area with a population density of 1,688.77/sq mi (1,049.36/km²). There are 80,724 housing units at an average density of 731.2 per square mile (454.35/km²).

Based on the above article, answer a question. How many more housing units are there than families?
23181