PORT ST. LUCIE — Voters Tuesday approved five changes to the city charter, according to final, unofficial results from the Supervisor of Elections Office. 

This is the first time in roughly 20 years the charter has been updated, city officials said. 

The five changes are: 

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• Filling a City Council vacancy of at least 12 months, instead of six months, by a single special election; approved by about 75% of voters
• Eliminating City Council roll-call voting and using majority consensus instead; approved by about 65% of voters
• Having City Council establish rules for each advisory board rather than the boards creating their own rules; approved by about 82% of voters
• Advertising the date and time of all ordinance public hearings in print or online as allowed by state law, at least 10 days in advance; approved by about 89% of voters
• Designating the Planning and Zoning Board as the city’s Local Planning Agency; approved by about 83% of voters