In what year was the album “Viena” released by Värttinä?

In what year was the album “Viena” released by Värttinä?: The album “Viena” was released in 2015 by Värttinä, featuring 2 tracks.
What is the most successful song from the album “Viena” by Värttinä?: “Kokko” is the biggest hit from the album “Viena” by Värttinä.

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