Question: What year did the CEO of Tata Consultancy Services takeover as Chairman?

<P0-S0> Tata Sons Limited is the holding company of the Tata Group and holds the bulk of shareholding in these companies. <P0-S1>  It was established as a trading enterprise in 1868. <P0-S2>  About 86% of the equity capital of Tata Sons is held by philanthropic trusts endowed by members of the Tata family. <P0-S3>  The biggest two of these trusts are the Sir Dorabji Tata Trust and Sir Ratan Tata Trust. <P0-S4>  Tata Sons is the owner of the Tata name and the Tata trademarks, which are registered in India and several other countries. <P0-S5>  TCS alone generates 70% revenues of its parent company, Tata Sons. <P0-S6>  Natarajan Chandrasekaran took over as Chairman of Tata Sons on 21 February 2017. <SEP> <P1-S0> Dr. Lalit Kanodia (born March 30, 1941) is an Indian business entrepreneur, credited with having created the software industry of India as the Founder CEO of Tata Consultancy Services (TCS), earlier called Tata Computer Center during 1967-1970. <P1-S1>  He is currently Chairman of Datamatics Group of Companies which he founded in 1975. <P1-S2>  He also holds the position of National President of the Indo - American Chamber of Commerce and Vice President of the Indian Merchants Chamber, both prestigious organizations of the Indian business community. <P1-S3>  He has also served as President of the Management Consultants Association of India. <SEP> <P2-S0> LC Singh is the Vice Chairman and CEO of Nihilent Technologies Ltd. <P2-S1> , a global integrated change management company headquartered at Pune, India. <P2-S2>  Singh founded Nihilent in the year 2000. <P2-S3>  Singh is an alumnus of the Institute of Technology (Banaras Hindu University) ,Varanasi] and Harvard Business School, and has contributed significantly towards building the Indian IT brand worldwide. <P2-S4>  Singh performed key roles at Tata Consultancy Services (TCS). <P2-S5>  At the time of leaving the company, he was the Senior Vice President, in charge of operations for UK, South Africa and the Middle East. <P2-S6>  He briefly worked with Zensar Technologies as President and CEO. <P2-S7>  He is the author of Nihilent's patented change management framework MC³ and 14Signals (a patented framework on Customer Loyalty Evaluation). <P2-S8>  He is an internationally internationally recognized thought leader on design & systems thinking, and is an invited speaker at global conferences on Design Thinking, Change Management, and Digital Disruption. <P2-S9>  Singh is a Fellow of The Institute of Management Consultants of India (IMCI) and Computer Society of India (CSI). <P2-S10>  He scripted and produced the movie Banaras, A mystic love story. <P2-S11>  He continues to be a student of ontology and epistemology <SEP> <P3-S0> Natarajan Chandrasekaran (born 1963) is the chairman of Tata Sons. <P3-S1>  Chandrasekaran took over as the CEO of Tata Consultancy Services (TCS) on November 6, 2009 prior to which he was COO and executive director of TCS. <P3-S2>  Born in 1963, Chandra is one of the youngest CEOs within the Tata Group. <P3-S3>  In January 2017, he was selected to become the next chairman of Tata Sons. <P3-S4>  He assumed chairmanship on 21 February 2017 and soon after was announced the chairman of Tata Motors. <P3-S5>  on July 3, he was appointed as chairman of Tata Global Beverages. <P3-S6>  He is the first non Parsi and professional executive to head the Tata Group.