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The year month range for historical metrics. If not specified, metrics for the past 12 months are returned. Search metrics are available for the past 4 years. If the search volume is not available for the entire yearMonthRange provided, the subset of the year month range for which search volume is available are returned.
YearMonthRange
The year month range inclusive of the start and end months. Eg: A year month range to represent Jan 2020 would be: (Jan 2020, Jan 2020).