Vanuatu
"Yumi, Yumi, Yumi" (We, We, We)

Words by: François Vincent Ayssav
Music by: François Vincent Ayssav
Adopted: 1980

Vanuatu gained its independence from both Britian and France in 1980. (I assume that during the colonial period, both anthems were used, however I do not know how they were performed). Upon independence, the anthem "Yumi, Yumi, Yumi", written in the native Bislama language (a type of Pigdin English/French hybrid), was chosen as the national anthem.