График частотности: эхо

[{"date": "2011-03-25", "qty": 3}, {"date": "2011-04-10", "qty": 3}, {"date": "2011-04-11", "qty": 3}, {"date": "2011-04-12", "qty": 3}, {"date": "2011-04-13", "qty": 6}, {"date": "2011-04-14", "qty": 4}, {"date": "2011-05-31", "qty": 6}, {"date": "2011-06-13", "qty": 3}, {"date": "2011-06-14", "qty": 6}, {"date": "2011-08-05", "qty": 8}, {"date": "2011-10-08", "qty": 9}, {"date": "2011-12-05", "qty": 9}, {"date": "2012-01-06", "qty": 8}, {"date": "2012-02-02", "qty": 3}, {"date": "2012-02-14", "qty": 13}, {"date": "2012-02-15", "qty": 11}, {"date": "2012-02-17", "qty": 9}, {"date": "2012-04-29", "qty": 11}, {"date": "2012-05-03", "qty": 3}, {"date": "2012-06-13", "qty": 4}, {"date": "2012-06-18", "qty": 4}, {"date": "2012-10-04", "qty": 12}, {"date": "2014-02-11", "qty": 3}, {"date": "2014-02-12", "qty": 9}, {"date": "2014-11-19", "qty": 9}, {"date": "2014-12-23", "qty": 11}, {"date": "2015-01-09", "qty": 6}, {"date": "2015-02-17", "qty": 10}, {"date": "2015-09-04", "qty": 7}, {"date": "2026-06-04", "qty": 3}]