Revitalization efforts have recently been ongoing. On September 27, 2007, the Jeju provincial government promulgated the Language Act for the Preservation and Promotion of the Jeju Language, which established five-year plans for state-backed language preservation.The Act encouraged public schools on Jeju Island to offer Jeju as an extracurricular activity, as well as to incorporate the language as a part of regular classes if relevant and feasible. In addition, multiple programs were provided for adults, as well. For example, adult language programs are offered every year at the Jeju National University and are all completely free of charge. There are also several local centres on Jeju Island that offer classes in Jeju Language specifically to marriage-based immigrants. However, it was not until UNESCO's 2010 designation of Jeju as critically endangered that the provincial government became proactive in Jeju preservation efforts. In 2016, the provincial government allotted ₩685,000,000 (US$565,592 in 2016) to revitalization programs, and the government-funded Jeju Research Institute has compiled phrasebooks of the language. The provincial Ministry of Education has also published Jeju textbooks for elementary and secondary schools, although some textbooks really teach Standard Korean interspersed with Jeju lexical items. Some public schools offer after-school programs for Jeju, but the short duration of these classes may be insufficient to promote more than "symbolic" use by students. The linguistic competence of many teachers has also been challenged.