[
  {
    "OrderID": 1,
    "Region": "West",
    "Sales": 50,
    "SalesWithTax": 60
  },
  {
    "OrderID": 2,
    "Region": "East",
    "Sales": 0,
    "SalesWithTax": 0
  },
  {
    "OrderID": 3,
    "Region": "North",
    "Sales": -25,
    "SalesWithTax": -30
  },
  {
    "OrderID": 4,
    "Region": "West",
    "Sales": null,
    "SalesWithTax": null
  }
]