Get last 7 days visite in csv format

Hello every one i like to have in csv format the visit of the seven last day
ex :
2015-07-11,150
2015-07-10,149
etc...
In XML i get out this result but in csv they dont work the visit are merge

Here my xml API code
index.php?module=API&method=VisitsSummary.getVisits&idSite=1&date=last10&period=day&format=xml&token_auth=#######################

Thanks