religions. Languages The four national languages of Switzerland are German, French, Italian and Romansh. In 2017, permanent residents who spoke German (mostly Swiss German dialects) as their main language or co-main language numbered about 63% (5.2 million), followed by 22.9% (1.9 million) for French (mostly Swiss French, but including some Franco-Provençal dialects), 8.2% (678,000) for Italian (mostly Swiss Italian, but including Insubric dialects) and less than 0.5% (44,000) for Romansh. The non-official language with the largest group of main or co-main language speakers (in 2017) is English with 448,000 speakers, followed by Portuguese with 303,000, Albanian with 262,000, followed by Serbo-Croatian with 205,000 speakers and Spanish with 197,000. All other languages totaled 640,000. Education Almost all Swiss are literate. Switzerland's 13 institutes of higher learning enrolled 99,600 students in the academic year of 2001–02. About 25% of the adult population hold a diploma of higher learning. According to the CIA World Factbook data for 2003, 99% of the Swiss population aged 15 and over could read and write, with the rate being identical for both sexes. During the 2008/09 school year there were 1,502,257 students in the entire Swiss educational system. In kindergarten or pre-school, there were 152,919 students (48.6% female). These students were taught by 13,592 teachers (96.0% female) in 4,949 schools, of which 301 were private schools. There were 777,394 students (48.6% female) in the obligatory schools, which include primary and lower secondary schools. These students were taught by 74,501 teachers (66.3% female) in 6,083 schools, of which 614 were private. The upper secondary school system had 337,145 students (46.9% female). They were taught by 13,900 teachers (42.3% female) in 730 schools, of which 240 were private. The tertiary education system had 234,799 students (49.7% female). They were taught by 37,546 teachers (32.8% female) in 367 schools. Regional disparities Source: Crime The police registered a total of 553,421 criminal offences in 2009, including 51 killings and 185 attempted murders. There were 616 cases of rape. In the same year, 94,574 adults (85% of them male, 47.4% of them Swiss citizens) were convicted under criminal law. 57.3% of convictions were for traffic offences. In the same year, 15,064 minors (78.3% of them male, 68.2% of them of Swiss nationality, 76.3% aged between 15 and 18) were convicted. The number of convicted persons is given in the following tables. Each class of crime references the relevant section of the Strafgesetzbuch