График частотности: делать

[{"date": "2018-03-18", "qty": 3}, {"date": "2018-04-16", "qty": 3}, {"date": "2018-09-08", "qty": 3}, {"date": "2018-09-12", "qty": 3}, {"date": "2018-09-18", "qty": 3}, {"date": "2018-12-01", "qty": 3}, {"date": "2018-12-09", "qty": 3}, {"date": "2018-12-13", "qty": 3}, {"date": "2019-01-02", "qty": 4}, {"date": "2019-02-22", "qty": 3}, {"date": "2019-06-02", "qty": 4}, {"date": "2019-08-28", "qty": 3}, {"date": "2019-09-18", "qty": 3}, {"date": "2019-09-21", "qty": 3}, {"date": "2020-02-04", "qty": 3}, {"date": "2020-03-02", "qty": 4}, {"date": "2020-05-18", "qty": 3}, {"date": "2020-06-13", "qty": 3}, {"date": "2020-07-21", "qty": 3}, {"date": "2020-08-01", "qty": 3}, {"date": "2020-08-02", "qty": 3}, {"date": "2020-12-17", "qty": 3}, {"date": "2021-04-29", "qty": 3}, {"date": "2021-05-24", "qty": 6}, {"date": "2021-06-30", "qty": 3}, {"date": "2021-07-05", "qty": 3}, {"date": "2021-11-22", "qty": 4}, {"date": "2021-12-15", "qty": 7}, {"date": "2021-12-18", "qty": 3}, {"date": "2022-03-18", "qty": 3}]