"date","quantity"
"2015-06-30","79765"
"2015-07-31","78061"
"2015-08-31","76574"
"2015-09-30","75244"
"2015-10-31","73575"
"2015-11-30","72584"
"2015-12-31","71156"
"2016-01-31","70290"
"2016-02-29","69187"
"2016-03-31","68344"
"2016-04-30","66824"
"2016-05-31","66359"
"2016-06-30","65253"
"2016-08-31","63126"
"2016-09-30","61924"
"2016-10-31","61168"
"2017-02-01","58428"
"2017-03-01","57876"
"2017-03-31","56994"
"2017-06-30","54503"
"2017-07-31","53640"
"2017-08-31","52759"