Click Get search volume to get historical data like average monthly search volume or forecasts in the exact same way as you would with keywords generated from the keyword search tool. (serps.com)
Specify the date range that you want to get average monthly search volume data for. (serps.com)
Moz's Keyword Analysis Tool allows you to enter up to 20 keywords to see their difficulty, average monthly search volume, and the top 10 websites ranking for them. (iacquire.com)