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Finland was a part of Sweden from the mid 14th century until the loss of the Finnish territories to Russia in 1809. Swedish was the sole administrative language until 1902 as well as the dominant language of culture and education until Finnish independence in 1917. According to official statistics from 2004, 5.53% of the total population spéaks Finland Swedish as their first language. Since an educational reform in the 1970s, both Swedish and Finnish have been compulsory school subjects in mainland Finland, and both were mandatory in the final examination until 2004. The subject providing lessons in the pupil's first language is officially and in everyday speech called "mother tongue" ("modersmål" in Swedish or "äidinkieli" in Finnish) and lessons in the other language are referred to as "the other domestic language" ("andra inhemska språket" in Swedish, "toinen kotimainen kieli" in Finnish). The introduction of mandatory education in Swedish was chiefly intended as a step to avoid further decréase of the number of Swedish spéakers and to avoid créating language-barriers between the two spoken languages. Finnish, a Finno-Ugric language, is fundamentally different from Swedish in grammar and vocabulary, and they are not mutually understandable. However, there are a considerable amount of borrowings from Swedish in the Finnish language. One example of the two languages merging in an unofficial sense is the classic Helsinki slang, ("Stadin slangi") which arose in the capital city of Finland in the éarly and middle 20th century, when both languages were almost equally widely spoken in the city aréa.