I would like to see the evolution of certain tags along time. For instance, questions involving genetics/biochemistry/DNA had grown, while those involving ecology/zoology/natural sciences declined?

Something like Google Books Ngram Viewer. Is it possible?

  • $\begingroup$ If you reach 25,000 rep, you get the the Google site statistics privilege and that may help. $\endgroup$ – AliceD Feb 18 '18 at 7:39
  • $\begingroup$ @AliceD Why so high reputation for this? It's simply out of reach for most users! Even you only have this much in one of your sites. $\endgroup$ – Rodrigo Feb 18 '18 at 13:11

To query tag popularity or any other public data you can use StackExchange Data Explorer.

Here is one query, as an example, that can show you the popularity of current top tags over time:
Top tags today show evolution in the past

  • $\begingroup$ Thank you, that's awesome! $\endgroup$ – Rodrigo Feb 18 '18 at 21:11
  • $\begingroup$ @Rodrigo No problem! Let us know of your results! $\endgroup$ – vkehayas Feb 19 '18 at 10:37

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