question: How many of the Fortune Global 100 companies are clients of the management consulting firm that William D. Green retired from in 2013?
answer: 94
context: Title: Accenture
  Passage: Accenture PLC is a global management consulting and professional services company that provides strategy, consulting, digital, technology and operations services.  A Fortune Global 500 company, it has been incorporated in Dublin, Ireland, since 1 September 2009.  In 2017, the company reported net revenues of $34.9 billion, with more than 425,000 employees serving clients in more than 200 cities in 120 countries.  In 2015, the company had about 130,000 employees in India, about 48,000 in the US, and about 50,000 in the Philippines.  On August 29, 2017, Apple Inc.  announced a partnership with Accenture to create iOS business solutions.  Accenture's current clients include 94 of the Fortune Global 100 and more than three-quarters of the Fortune Global 500.
  Title: Katzenbach Partners
  Passage: Katzenbach Partners was a small American management consulting firm.  In 2009 it became a part of the global management consulting firm Booz & Company.
  Title: NouvEON
  Passage: NouvEON (officially NouvEON Technology Partners) is an employee-owned Management Consulting and Information Technology Consulting firm.  NouvEON offers strategic- and project-based management consulting services to improve business performance for their clients.  Headquartered in Charlotte, North Carolina, NouvEON also has offices in Raleigh, North Carolina and professional consultants in Philadelphia, Pennsylvania; Baltimore, Maryland; Minneapolis, Minnesota; and Houston, TX.
  Title: William D. Green
  Passage: William "Bill" D. Green (born August 1953) is an American business executive.  He is the retired (as of 2/1/2013) executive chairman of the global Accenture management consulting firm.
citations: Accenture William D. Green