The abundant supply of English speakers and competitive labor costs have enabled the Philippines to become a choice destination for foreign companies wishing to establish call centers and other outsourcing.[13][14][15] English proficiency sustains a major call center industry and in 2005, America Online had 1,000 people in what used to be the US Air Force's Clark Air Base in Angeles City answering ninety percent of their global e-mail inquiries. Citibank does its global ATM programming in the country, and Procter & Gamble has over 400 employees in Makati, a central Manila neighborhood, doing back office work for their Asian operations including finance, accounting, Human Resources and payments processing.