According to the Association of Catholic Colleges and Universities in 2011, there are approximately 230 Roman Catholic universities and colleges in the United States with nearly 1 million students and some 65,000 professors. 12 Catholic universities are listed among the top 100 national universities in the US. Catholic schools educate 2.7 million students in the United States, employing 150,000 teachers. In 2002, Catholic health care systems, overseeing 625 hospitals with a combined revenue of 30 billion dollars, comprised the nation's largest group of nonprofit systems. Owing to its size, more Catholics hold college degrees (26% of all US Catholics) and earn over $100,000 per year (19% of all US Catholics) than do members of any other US denomination.