Since the skyscraper era began, the great majority of skyscrapers were used predominantly as office space. From 1930 to 2000, the percentage of office towers never fell below 86 percent, but in the future it is expected to be as low as 46 percent. By 2010, fewer than half of the 100 tallest buildings in the world were office towers, the majority being for residential and mixed use. Only four of the ten tallest buildings in the world, and twenty-eight of the top fifty, were used primarily as offices.
