The proportion of pupils completing a primary education fell from 90% in 1991 to 72% in 2004 and up to 78% in 2012. Port Vila and three other centres have campuses of the University of the South Pacific, an educational institution co-owned by twelve Pacific countries. The campus in Port Vila, known as the Emalus Campus, houses the University's law school. Vanuatu culture retains a strong diversity through local regional variations and through foreign influence. Vanuatu may be divided into three major cultural regions. In the north, wealth is established by how much one can give away, through a grade-taking system. Pigs, particularly those with rounded tusks, are considered a symbol of wealth throughout Vanuatu. In the centre, more traditional Melanesian cultural systems dominate. In the south, a system involving grants of title with associated privileges has developed. Young men undergo various coming-of-age ceremonies and rituals to initiate them into manhood, usually including circumcision. Most villages have a "nakamal" or village clubhouse, which serves as a meeting point for men and a place to drink "kava". Villages also have male- and female-only sections. These sections are situated all over the villages; in "nakamals", special spaces are provided for females when they are in their menstruation period. There are few prominent ni-Vanuatu authors. Women's rights activist Grace Mera Molisa, who died in 2002, achieved international notability as a descriptive poet. The traditional music of Vanuatu is still thriving in the rural areas of Vanuatu. Musical instruments consist mostly of idiophones: drums of various shape and size, slit gongs, stamping tubes, as well as rattles, among others. Another musical genre that has become widely popular during the 20th century in all areas of Vanuatu, is known as "string band" music. It combines guitars, ukulele, and popular songs. More recently the music of Vanuatu, as an industry, grew rapidly in the 1990s and several bands have forged a distinctive ni-Vanuatu identity. Popular genres of modern commercial music, which are currently being played in the urban areas include zouk music and reggaeton. Reggaeton, a variation of Dancehall Reggae spoken in the Spanish language, played alongside its own distinctive beat, is especially played in the local nightclubs of Port Vila with, mostly, an audience of Westerners and tourists.