Number of employees working in various departments of ABC company limited over 6 years? Departments (Number of employees) Years Production Marketing Corporate Accounts Research 2011 180 35 45 40 80 2012 215 36 40 60 71 2013 420 62 25 85 70 2014 460 70 35 95 75 2015 525 75 36 125 78 2016 510 70 38 120 80 In which year the total number of employees reached approximately twice the total number of employees than the company had in the year 2011?