According to the Constitution of Singapore, the four official languages of Singapore are Malay, Mandarin, Tamil, and English, while the national language is Malay. The three languages other than English were chosen to correspond with the major ethnic groups present in Singapore at the time: Mandarin had gained status since the introduction of Chinese-medium schools; Malay was deemed the "most obvious choice" for the Malay community; and Tamil for the largest Indian ethnic group in Singapore, in addition to being "the language with the longest history of education in Malaysia and Singapore". In 2009, more than 20 languages were identified as being spoken in Singapore, reflecting a rich linguistic diversity in the city. Singapore's historical roots as a trading settlement gave rise to an influx of foreign traders, and their languages were slowly embedded in Singapore's modern day linguistic repertoire.