More than half of HMC schools are now either partially or fully co-educational.[35] Of the Clarendon nine, two are fully co-educational (Rugby and Shrewsbury), two admit girls to the sixth form only (Charterhouse and Westminster), two remain as boys-only day schools (St Paul's[36] and Merchant Taylors') and three retain the full-boarding, boys-only tradition (Eton, Harrow and Winchester). The newest independent school to join the HMC is Yarm School, which was founded in 1978.[citation needed]