How many UN Conventions has Singapore ratified?

Following up from an earlier post, a quick search shows that Singapore has only ratified 2 out of the 7 major UN conventions. (Note: 2 more new conventions are coming online)

The 2 conventions that are ratified

• Convention on the Elimination of All Forms of Discrimination against Women
• Convention on the Rights of the Child

Also of note is that the optional protocols to both conventions above have not been ratified.

The ones which our Singapore government has yet to ratify

• International Covenant on Civil and Political Rights (1966) and its optional protocols
• International Covenant on Economic, Social and Cultural Rights (1966)
• International Convention on the Elimination of All Forms of Racial Discrimination (1965)
• Convention Against Torture and Other Cruel Inhuman or Degrading Treatment or Punishment and its optional protocol
  
• International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families (1990)