The Zagat Survey was established by Tim and Nina Zagat in 1979 as a way to collect and correlate the ratings of restaurants by diners. For their first guide, covering New York City, the Zagats surveyed their friends. As of 2005, the Zagat Survey included 70 cities, with reviews based on the input of 250,000 individuals reporting over the years. In addition to restaurants, Zagat guides rate hotels, nightlife, shopping, zoos, music, movies, theaters, golf courses, and airlines. The guides are sold in book form, and formerly as a paid subscription on its web site.