Usage of other languages, along with Ukrainian, was allowed in local institutions located in places of residence of the majority of citizens of the corresponding ethnicities. Citizens were guaranteed the right to use their native or any other languages and were entitled to address various institutions and organisations in Ukrainian, in Russian, or in another language of their work, or in a language acceptable to the parties. After the Ukrainian accession of independence following the dissolution of the Soviet Union the law, with some minor amendments, remained in force in the independent Ukrainian state. Adopted in 1996, the new Constitution of Ukraine confirmed the official state status of the Ukrainian language, and guaranteed the free development, use, and protection of Russian and other languages of national minorities of Ukraine. Language issues are still used by politicians to generate controversy. On May 20, 2008, Donetsk city council passed a resolution limiting the expansion of Ukrainian-language education in the city. The following day the city prosecutor declared the decision illegal and the mayor suspended it, and the council reversed itself two days later. According to a March 2010 survey, forced Ukrainization and Russian language suppression are among the least troubling problems for Ukrainian citizens, concerning only 4.8% of population. Educational system The government of independent Ukraine implemented policies to broaden the use of Ukrainian and mandated a progressively increased role for Ukrainian in the media and commerce. The most significant was the government's concerted effort to implement Ukrainian, as the only official state language in the country, into the state educational system. Despite the Constitution, the Law on Education (grants Ukrainian families (parents and their children) a right to choose their native language for schools and studies) as well as the Law of Languages (a guarantee for the protection of all languages in Ukraine) the education system gradually reshaped from a system that was only partly Ukrainian to the one that is overwhelmingly so. The Russian language is still studied as a required course in all secondary schools, including those with Ukrainian as the primary language of instructions. The number of secondary school students who received their primary education in Ukrainian grew from 47.9% in 1990–1991 (the last school year before Ukrainian independence) to 67.4% in 1999 and to 75.1% by 2003–2004 (see table). Ukrainization has achieved even greater gains in higher education institutions where as of 1990–1991 only 7% of students