Stacked Bars chart

// Use Morris.Bar
Morris.Bar({
  element: 'graph',
  data: [
    {x: 'Raihan', y: 30, z: 20},
    {x: 'Samiul', y: 20, z: 20},
    {x: 'Mamun', y: 10, z: 20},
    {x: 'Rashed', y: 20, z: 40}
  ],
  xkey: 'x',
  ykeys: ['y', 'z'],
  labels: ['OTC', 'MRC'],
  horizontal: true,
  stacked: true
});