During the 1980s, SAS was one of Inc. Magazine's fastest growing companies in America from 1979 and 1985. It grew more than ten percent per year from $10 million in revenues in 1980 to $1.1 billion by 2000. In 2007, SAS revenue was $2.15 billion, and in 2013 its revenue was $3.02 billion. By the late 1990s, SAS was the largest privately held software company. The Associated Press reported that analysts attributed the growth to aggressive R&D spending. It had the highest ratio of its revenues spent on R&D in the industry for eight years, setting a record of 34 percent of its revenues in 1993, as it was working on a new menu-based interface. The company began its relationship with Microsoft and development for Windows operating systems in 1989. Shortly afterwards it established partnerships with database companies like Oracle, Sybase and Informix.