The signature requiement at the time was 25% of turnout in mayoral election, which ended up being 6% of registered voters. In 1984, the changed the law to 25% of registered voters (and, the article mentions eligible voters for non-at large council members).
The largest municipalities with recall elections are Raleigh, Greensboro and Winston-Salem. Combined, the three have an average population more than 307,000.
Troutman, with a 2011 population of 2,409, is the fourth-smallest town with recall elections, behind Topsail Beach (377), Foxfire (913) and Belhaven (1,685).