{
  "monthly": [
    {
      "month": "2012-01",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-02",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-03",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-04",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-05",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-06",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-07",
      "amount": "39.62",
      "bills": 7
    },
    {
      "month": "2012-08",
      "amount": "47.62",
      "bills": 7
    },
    {
      "month": "2012-09",
      "amount": "46.71",
      "bills": 6
    },
    {
      "month": "2012-10",
      "amount": "42.62",
      "bills": 7
    },
    {
      "month": "2012-11",
      "amount": "37.62",
      "bills": 7
    },
    {
      "month": "2012-12",
      "amount": "37.62",
      "bills": 7
    }
  ],
  "annual": {
    "2011": "469.58",
    "2012": "477.53"
  },
  "priorAmount": "42.62",
  "currentAmount": "37.62",
  "difference": "-5.00",
  "changeRatio": "-0.1173158141717503519474425153",
  "calculation": "Read-only original Invoice rows, Python date-string grouping and Decimal."
}