Between 2009 and 2011, the number of Hindawi journals nearly doubled, and Hindawi's output increased from 2,500 to 13,000 articles per year. By 2011, Hindawi was publishing 300 journals, and had a staff of over 450 people. The growth of the company has come from publishing new start-up journals, as well as acquisitions of established journals such as "Psyche", an entomological journal founded in 1874. Two major factors facilitating the company's growth have been the low labor costs and well-educated middle class of Cairo. Hindawi's publishing portfolio includes 233 journals.