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The trick is the following configuration options:
var lineChartOptions = {
scaleOverride: true,
scaleSteps: 4,
scaleStepWidth: 25,
scaleStartValue: 0,
scaleLabel: "<%=value%>%"
};
Source: http://www.chartjs.org/docs/#getting-started-global-chart-configuration
Source:stackexchange.com