"Top Growth" keywords are the keywords with the greatest positive or negative change in Search Popularity. This allows you to see the changing trends in keyword search, and monitor keywords accordingly.
For the chosen period of time, we calculate the change in Search Popularity score across all followed keywords for the given country and language. You can sort them by "Best Search Popularity Growth" (greatest popularity increase):
or "Worst Search Popularity Growth" (greatest popularity decrease).
The up/down arrow (left of the keyword) shows the amount of change, and the numbers at the right (e.g. 6 > 20 ) show the start/end popularity values for the date range. Currently supported countries: USA, UK, AUS, NZ, CA, MX and CH.
Check all details on the Top Growth Keywords in this post.