Biology — ABO Blood Group Distribution

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "ABO blood group distribution",
  "data": {"values": [
    {"group":"O","percent":44},
    {"group":"A","percent":42},
    {"group":"B","percent":10},
    {"group":"AB","percent":4}
  ]},
  "mark": "arc",
  "encoding": {
    "theta": {"field":"percent","type":"quantitative"},
    "color": {"field":"group","type":"nominal","title":"Blood group"}
  }
}