These are the six most diminishing topics, in order. 

Of all the topics in the chosen taxonomy, these show the topics with the greatest decrease in impact, as highlighted in the insight, over the most recent time period (month or quarter). 

Diminishing topics should be reviewed as they demonstrate previously high impacting topics are no longer obtaining the impact in coverage and public scrutiny that they once were.

It is important to note that the scales across each of the 6 Topics are different.