Seoul city says it will add 3,000 bicycles to its public bike rental service Ttareungi by the end of the year in response to growing demand.

Mayor Oh Se-hoon announced the plan on Friday, which will increase the capital's fleet of bicycles to 43,500 next year.

More than 200 rental stations will also be installed to give residents easier access to the service, the mayor said.

City data shows the utilization rate for Ttareungi between January and September increased 36.4 percent from the same period last year.

The green and white bicycles were used the most during morning and evening commute hours, with 3.2 million members as of the end of last month.

Ttareungi bikes can be used by anyone after downloading the Seoul Bike mobile app and registering or logging in with a Naver, Facebook or Kakao account.

The app is available in both Korean and English.