This year's survey covers the 1995 through 2002 model years.
The surveys covered the first group of students to join the program.
The survey, described as preliminary, covered about 10 percent of the programs in the city.
The survey covered 347 communities, including small towns and large cities.
This year the survey covered a larger territory and missed 15 percent, according to city officials.
The most recent survey, covering a sampling of 19,000 apartments, was done in 1987.
The survey covered around 400 companies across various industry verticals, making it the largest of its kind.
The survey, the most comprehensive global look that the agency has taken of mental health policies, covered its 191 member countries.
The survey does not cover Manhattan, where there are few single-family homes.
The survey covered 1,753 national spots of all lengths produced by 20 agencies.