30 percent of the white collar workers don't eat at home, according to a survey about the status of white collars eating at home.

The survey shows that more than 42 percent of white collar workers in Shenzhen don't go home to eat, which is the highest among the four big cites: Shenzhen, Guangzhou, Beijing and Shanghai. The number of Guangzhou is 40 percent, followed by Beijing with 35 percent.
What can we tell from this survey?