From the google charts api page

The Google Chart Tools: Image Charts API was deprecated by Google on April 20, 2012 and can be shutdown at any time. We do not recommend using this module for any new projects. Various options are being considered regarding future versions of the chart module, refer to #2376179: Chart 7.x-3.x Release for more details.

The Charts module supports the more recent Google Interactive charts, and is a valid alternative to consider. Refer to the Comparison of Charting modules for other possible alternatives to consider.

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