Area Chart

{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "width": 300,
  "height": 200,
  "data": {"url": "data/unemployment-across-industries.json"},
  "mark": "area",
  "encoding": {
    "x": {
      "timeUnit": "yearmonth", "field": "date", "type": "temporal",
      "axis": {"format": "%Y"}
    },
    "y": {
      "aggregate": "sum", "field": "count", "type": "quantitative",
      "axis": {"title": "count"}
    }
  }
}