According to an official survey run on behalf of the "Collectivité territoriale de Corse" which took place in April 2013, in Corsica the Corsican language has a number of speakers between 86,800 and 130,200, out of a total population amounting to 309,693 inhabitants. Only 28% of the overall population is able to speak Corsican well, whilst an additional 14% has a capacity to speak it "quite well". The percentage of those who have a solid oral understanding of the language varies between a minimum of 25 percent in the 25–34 age group and the maximum of 65 percent in the over-65 age group: almost a quarter of the former age group does not understand Corsican, while only a small minority of the older people do not understand it. While 32 percent of the population of northern Corsica speaks Corsican quite well, this percentage drops to 22 percent for South Corsica. Moreover, 10 percent of the population of Corsica speaks only French, while 62 percent speak both French and at least some Corsican. However, only 8 percent of the Corsicans know how to write correctly in Corsican, while about 60 percent of the population does not know how to write in Corsican. While 90 percent of the population is in favor of a Corsican-French bilingualism, 3 percent would like to have Corsican as the only official language in the island, and 7 percent would prefer French in this role.