График частотности: братьев

[{"date": "2013-05-20", "qty": 3}, {"date": "2013-07-04", "qty": 8}, {"date": "2013-07-05", "qty": 5}, {"date": "2013-07-06", "qty": 3}, {"date": "2013-07-13", "qty": 3}, {"date": "2013-08-14", "qty": 3}, {"date": "2013-08-15", "qty": 5}, {"date": "2013-08-16", "qty": 4}, {"date": "2013-08-17", "qty": 6}, {"date": "2013-08-18", "qty": 6}, {"date": "2013-08-19", "qty": 3}, {"date": "2013-08-20", "qty": 6}, {"date": "2013-08-22", "qty": 3}, {"date": "2013-09-25", "qty": 3}, {"date": "2013-11-13", "qty": 8}, {"date": "2014-08-30", "qty": 4}, {"date": "2014-09-03", "qty": 4}, {"date": "2015-01-09", "qty": 5}, {"date": "2015-04-11", "qty": 3}, {"date": "2017-09-15", "qty": 5}, {"date": "2017-09-17", "qty": 5}, {"date": "2018-10-08", "qty": 3}, {"date": "2018-12-08", "qty": 3}, {"date": "2019-09-10", "qty": 4}, {"date": "2019-11-07", "qty": 3}, {"date": "2020-11-12", "qty": 3}, {"date": "2021-08-23", "qty": 3}, {"date": "2022-01-03", "qty": 3}, {"date": "2022-10-19", "qty": 3}, {"date": "2022-12-01", "qty": 3}]