Could it be because you are using the viewWindow to set the max/min instead 
of using the vAxis 'minValue' and 'maxValue' attributes? Also try setting 
your viewWindow style to 'pretty' 

vAxis: { viewWindowMode: 'pretty', baseline: 0, minValue: 0, maxValue: 100, 
minorGridlines: { count: 1 }, gridlines: { count: -1 } },

Something like the above. My guess is the viewWindow....

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