From Ref

To see more up-to-date and regularly updated pageview counts for the subwiki sites, see analytics.vipulnaik.com.

Here is our list of subject wikis:

NOTE: The creation month need not coincide with the month of MediaWiki installation. In cases where the wiki was ported from elsewhere, the creation month may be earlier; in other cases, it may be later if the first edits happened long after installation.

Pageview count note: Estimates are based on Google Analytics data, not based on MediaWiki internal logs, which record about 2-3X the pageviews recorded by Google Analytics.

You can access the history of subject wikis here.