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| dt | price_sum |
|---|---|
| 2019-01-01 | 299 |
| 2019-02-01 | 299 |
| 2019-03-01 | 1098 |
| 2019-04-01 | 799 |
| 2019-05-01 | 799 |
| 2019-06-01 | null |
| 2019-07-01 | null |
| 2019-08-01 | null |
| 2019-09-01 | null |
| 2019-10-01 | null |
| 2019-11-01 | null |
| 2019-12-01 | null |