[
    {
      "category": "item1",
      "amount": 90
    },
    {
      "category": "item2",
      "amount": 100
    },
    {
      "category": "item3",
      "amount": 120
    },
    {
      "category": "item4",
      "amount": 130
    },
    {
      "category": "item5",
      "amount": 140
    },
    {
      "category": "item6",
      "amount": 150
    },
    {
      "category": "item7",
      "amount": 160
    },
    {
      "category": "item8",
      "amount": 170
    },
    {
      "category": "item9",
      "amount": 180
    }
  ]