Although the only official language of Guinea-Bissau since independence, Standard Portuguese is spoken mostly as a second language, with few native speakers and its use is often confined to the intellectual and political elites. It is the language of government and national communication as a legacy of colonial rule. Schooling from the primary to tertiary levels is conducted in Portuguese, although only 67% of children have access to any formal education. Data suggests that the number of Portuguese speakers ranges from 11 to 15%. In the latest census (2009) 27.1% of the population claimed to speak non-creole Portuguese (46.3% of city dwellers and 14.7% of the rural population, respectively). Portuguese creole is spoken by 44% of the population and is effectively the lingua franca among distinct groups for most of the population. Creole's usage is still expanding, and it is understood by the vast majority of the population. However, decreolisation processes are occurring, due to undergoing interference from Standard Portuguese and the creole forms a continuum of varieties with the standard language, the most distant are basilects and the closer ones, acrolects. A post-creole continuum exists in Guinea-Bissau and crioulo 'leve' ('soft' creole) variety being closer to the Portuguese-language norm.