1. Change maxValue to say 20 so you can in fact visually see the decimal 
variations (i.e., tenths) in the lengths of each bar 

2. Consider including 'format': '##.#', in this line:

'hAxis': {'minValue': 0.0, 'maxValue': 60.0},

I.e.,

'hAxis': {format: '##.#', 'minValue': 0.0, 'maxValue': 60.0},

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