In what year was the album “Mr. Mr.” released by Girls' Generation?

In what year was the album “Mr. Mr.” released by Girls' Generation?: The album “Mr. Mr.” was released in 2014 by Girls' Generation, featuring 6 tracks.
What is the most successful song from the album “Mr. Mr.” by Girls' Generation?: “Mr. Mr.” is the biggest hit from the album “Mr. Mr.” by Girls' Generation.

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