График частотности: вануату

[{"date": "2011-06-04", "qty": 15}, {"date": "2011-06-05", "qty": 6}, {"date": "2011-06-17", "qty": 9}, {"date": "2011-06-18", "qty": 8}, {"date": "2011-06-19", "qty": 8}, {"date": "2011-06-20", "qty": 27}, {"date": "2011-07-20", "qty": 4}, {"date": "2011-07-21", "qty": 6}, {"date": "2013-03-22", "qty": 4}, {"date": "2013-05-20", "qty": 3}, {"date": "2018-12-22", "qty": 4}, {"date": "2021-01-30", "qty": 4}]