vega-lite.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "description": "Population over time.",
  "data": {
    "values": [
      {"year": 1907,"population": 51815},
      {"year": 2011,"population": 310956},
      {"year": 2017,"population": 269022}
    ]
  },
  "mark": {
    "type": "line",
    "interpolate": "monotone"
  },
  "encoding": {
    "x": {
      "field": "year",
      "type": "temporal",
      "axis": {
        "format": "%Y"
      }
    },
    "y": {
      "field": "population",
      "type": "quantitative"
    }
  }
}