<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Welsh medium education should be distinguished from the teaching of the Welsh language itself as an academic subject . Welsh as a subject is taught as a first language in Welsh medium schools . In the majority of English medium schools, Welsh is taught as a second language and became compulsory for all pupils in Wales at Key Stages 1, 2 and 3 (up to age 14) in 1990 . In 1999, it became a compulsory subject for Key Stage 4 pupils (GCSE (ages 15 and 16)). Provision of Welsh as a subject in independent (private) schools is less widespread--only a few provide it, and it is taught as a second language . There is no private designated Welsh - medium school in Wales, although one does exist in London, known as the London Welsh School . </P> <P> Sixteen per cent of pupils in Wales attend Welsh - medium schools, with a further 10 per cent attending schools that are bilingual, dual - medium, or in English with significant Welsh provision . Children wishing to join a Welsh medium school do not have to speak Welsh to attend if they are young enough to learn the language quickly . Ysgol Glan Clwyd is an example: although 70 per cent of the pupils attending this school come from homes where English is the main or only language, 95 per cent of pupils finish their education speaking Welsh as proficiently as a native speaker . Ysgol Glan Clwyd was the first Welsh - medium secondary (comprehensive) school, and opened in Rhyl in 1956 . </P>

When did the welsh language became a core subject in the national curriculum in wales