this is now the output 

var data22 = google.visualization.arrayToDataTable([
[['date', 'pet 2l', 'pet 1,5', 'pet 1l', 'pet 50cl', 'pet 33cl', 'can 
33cl', 'can 25cl', 'Rb 25cl', 'Rb 35cl'] 
,['2013-04-01',2352,235,23523,3523,235,235,23,235,235],['2013-06-02',23525,252,2352,235,23523,2352,2352,2352,23],['2013-07-01',0,0,0,0,0,0,0,0,0],['2013-08-06',345,343,34,4543,435,3453,345,345,435],['2013-09-01',100,4,6,33,11,36,37,38,16]]
 

 ]); 

but there's an error message on screen :

Data column(s) for axis #0 cannot be of type stringĂ—

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