On 10 November 1989, Bulgaria's Communist regime was overthrown. On 29 December, the government allowed the Turks of Bulgaria to resume use of their Turkish names. This decision was recognized by law in March 1990. By 1991, some 600 thousand applications were received for the reinstatement of Turkish birth given names. Also in 1991, the Institutition of the Spiritual leader of the Muslims in Bulgaria, the Grand Mufti's Office was founded. In 1991 a new Constitution was adopted granting citizens of non-Bulgarian origin a wide range of rights and lifting the legislative ban on teaching in Turkish. In January of the same year another law was adopted allowing the Turks to change their names or "strike out" their Slavonic endings like "ov", "ova", "ev", "eva" within three years.