at least 2.10 to keep population right ?in reference to:
"According to latest 2010 statistics, Singapore’s resident total fertility rate (TFR) reached a level of 1.22 in 2009. The Chinese TFR was (1.08), followed by Indians (1.14) and Malays (1.82). Malay fertility-rate is ~70% higher than Chinese and Indians."
- Singapore - Wikipedia, the free encyclopedia (view on Google Sidewiki)