График частотности: знавать

[{"date": "2014-10-31", "qty": 3}, {"date": "2015-07-20", "qty": 3}, {"date": "2015-08-02", "qty": 10}, {"date": "2015-10-14", "qty": 3}, {"date": "2015-10-18", "qty": 3}, {"date": "2016-05-12", "qty": 6}, {"date": "2016-06-15", "qty": 3}, {"date": "2016-09-14", "qty": 3}, {"date": "2017-10-13", "qty": 6}, {"date": "2017-10-14", "qty": 6}, {"date": "2017-10-15", "qty": 6}, {"date": "2017-10-16", "qty": 5}, {"date": "2017-10-17", "qty": 4}, {"date": "2018-09-23", "qty": 3}, {"date": "2019-04-22", "qty": 5}, {"date": "2020-02-26", "qty": 3}, {"date": "2020-05-09", "qty": 4}, {"date": "2020-09-23", "qty": 3}, {"date": "2020-11-06", "qty": 3}, {"date": "2021-06-20", "qty": 3}, {"date": "2021-11-19", "qty": 3}, {"date": "2022-02-14", "qty": 4}, {"date": "2022-06-17", "qty": 3}, {"date": "2022-09-20", "qty": 4}]