In 2013, 40% of Oslo's primary school pupils were registered as having a first language other than Norwegian or Sami. The western part of the city is predominantly ethnic Norwegian, with several schools having less than 5% pupils with an immigrant background. The eastern part of Oslo is more mixed, with some schools up to 97% of immigrant background. Schools are also increasingly divided by ethnicity, with white flight being present in some of the northeastern suburbs of the city. In the borough of Groruddalen in 2008 for instance, the ethnic Norwegian population decreased by 1,500, while the immigrant population increased by 1,600.