About 93% of Finns can speak a second language. The figures in this section should be treated with caution, as they come from the official Finnish population register. People can only register one language and so bilingual or multilingual language users' language competencies are not properly included. A citizen of Finland that speaks bilingually Finnish and Swedish will often be registered as a Finnish only speaker in this system. Similarly "old domestic language" is a category applied to some languages and not others for political not linguistic reasons, for example Russian.