График частотности: нормандской

[{"date": "2015-02-11", "qty": 3}, {"date": "2015-02-12", "qty": 15}, {"date": "2015-02-13", "qty": 12}, {"date": "2015-02-14", "qty": 10}, {"date": "2015-02-15", "qty": 15}, {"date": "2015-02-16", "qty": 8}, {"date": "2015-02-24", "qty": 3}, {"date": "2015-03-06", "qty": 3}, {"date": "2015-04-21", "qty": 3}, {"date": "2015-04-30", "qty": 3}, {"date": "2015-06-23", "qty": 3}, {"date": "2015-07-17", "qty": 4}, {"date": "2015-08-10", "qty": 3}, {"date": "2015-08-18", "qty": 3}, {"date": "2015-08-26", "qty": 3}, {"date": "2015-09-12", "qty": 6}, {"date": "2015-10-02", "qty": 17}, {"date": "2015-10-03", "qty": 13}, {"date": "2015-10-04", "qty": 5}, {"date": "2015-10-05", "qty": 5}, {"date": "2015-10-06", "qty": 4}, {"date": "2015-10-07", "qty": 4}, {"date": "2015-11-06", "qty": 3}, {"date": "2015-12-30", "qty": 3}, {"date": "2016-10-19", "qty": 6}, {"date": "2017-07-24", "qty": 3}, {"date": "2019-09-13", "qty": 3}, {"date": "2019-12-09", "qty": 8}, {"date": "2020-08-26", "qty": 4}]