Here's a very rough gauge of the grown of MO in the last 8 years. The only other time there was a moderator election where a "constituent" badge was awarded was in 2013. There are currently
16 pages of "constituent" badge awardees. The cutoff between those awarded for the current election and those awarded for the 2013 election is currently on page 11. So if the election ended today, I'd be estimating 2-fold growth in the last 8 years.