График частотности: знаки

[{"date": "2015-03-25", "qty": 4}, {"date": "2015-04-18", "qty": 6}, {"date": "2015-12-21", "qty": 3}, {"date": "2016-02-18", "qty": 3}, {"date": "2016-04-26", "qty": 4}, {"date": "2017-11-07", "qty": 9}, {"date": "2017-11-23", "qty": 3}, {"date": "2017-11-24", "qty": 3}, {"date": "2017-11-25", "qty": 3}, {"date": "2017-11-26", "qty": 3}, {"date": "2017-12-12", "qty": 4}, {"date": "2017-12-13", "qty": 3}, {"date": "2017-12-18", "qty": 7}, {"date": "2017-12-19", "qty": 6}, {"date": "2017-12-20", "qty": 3}, {"date": "2020-07-22", "qty": 3}, {"date": "2020-08-08", "qty": 3}, {"date": "2020-08-09", "qty": 3}, {"date": "2021-01-09", "qty": 4}, {"date": "2021-06-16", "qty": 4}, {"date": "2023-06-05", "qty": 3}, {"date": "2023-12-22", "qty": 3}, {"date": "2024-02-21", "qty": 4}, {"date": "2024-03-25", "qty": 3}, {"date": "2024-05-15", "qty": 4}, {"date": "2024-07-09", "qty": 3}, {"date": "2025-04-02", "qty": 3}, {"date": "2025-09-10", "qty": 4}, {"date": "2026-01-01", "qty": 3}, {"date": "2026-01-13", "qty": 3}]