To see the historical performance of a keyword, scroll down to the table under “Your Keywords Rankings” section. You can also reach there by clicking on the “Keyword Rankings” button on the floating bar. Proceed to click on the right-pointing arrow next to the keyword for which you want to see the historical performance as illustrated in the image below:
Upon clicking on the right-pointing arrow next to a keyword, you’ll see its historical performance over time. This is depicted in the form of a graph.