Uh...... Doesn't a high proportion of public debt to GDP represent an overleveraged government? That kinda means that the government has borrowed heavily, compared to the value of the output from the country.
So then, it doesn't make sense that you're yay-ing about Singapore being in the "top 10" list of indebted countries. :3
In fact, Singapore's debt is mostly local, and probably includes CPF, which is compulsory. This generates an inflated view of the Singapore government's debt.