The government of Singapore promotes the use of Mandarin. The use of other Chinese varieties, like Hokkien, Teochew, Cantonese and Hakka, has been declining over the last two decades, although they are still being used especially by the older generations of the Chinese population. About 60% of Indian Singaporeans are Tamils although the percentage of those who speak Tamil at home has been declining, with around 37% of Singaporean Indians speaking Tamil at home according to the 2010 census. Other spoken Indian languages are Punjabi, Malayalam, Hindi and Bengali, but none of them alone is spoken by more than 10% of the Indian Singaporeans. As with Chinese Singaporean, a large proportion of Indian Singaporeans speak English at home. Around 5,000 to 10,000 Peranakans, the early Chinese population of the region, still use the Hokkien-influenced Malay dialect called Baba Malay. Religion The main religions of Singapore are Buddhism, Taoism, Islam, Christianity, and Hinduism, with a significant number who profess no religion. Singapore has freedom of religion, although the government restricts some religions such as Jehovah's Witnesses, due to their opposition to conscription. The majority of Malays are Muslim, while the plurality of Chinese practise Buddhism and syncretic Chinese folk traditions. Christianity is growing in the country. Taoism was overtaken as the second-most important religion in the 2000 census among the Chinese as more have increasingly described themselves as Buddhists rather than Taoist. Indians are mostly Hindus though many are Muslims, Sikhs, and Christians. People who practise no religion form the third-largest group in Singapore. Marriage and divorce Literacy and education Among residents aged 25–39 years, the percentage of university graduates increased from 23.7% in 2001 to 45.9% in 2011 while that who had attained a diploma or professional qualification increased from 15.9% to 22.9% over the same period. Employment In 2005, the unemployment rate for persons aged 15 years and over was 2.5%, the lowest in the last four years, with a labour force of 2.3 million people. Household income Average household monthly income The average household monthly income was SGD 4,943 in 2000, which was an increase of $3,080 in 1990 at an average annual rate of 4.9%. The average household income experienced a drop of 2.7% in 1999 due to economic slowdown. Measured in 1990 dollars, the average household monthly income rose from SGD$3,080 in 1990 to SGD$4,170 in 2000 at an average annual rate of 2.8%. Household income