sentences:  Later an increasing number would also choose to settle permanently in Singapore, especially in the 1920s when more chose to remain in Singapore rather than leave.Change in social attitude in the modern era also meant that Chinese women were freer to emigrate from China, and the sex ratio began to normalise in the 20th century, which led to a much greater number of people being born in Singapore.Immigration continued to be the main reason for the Chinese population increase in Singapore until the 1931–1947 period when the natural increase in population surpassed the net immigration figure.