If you want to correlate with population size, some
Forex reserve per capita numbers for your reference.
A few points to notice on Forex:
- Forex pile up at industrialized countries with trade surpluses e.g. China, Japan, Korea, Taiwan & Germany (ranked #12)
- Countries with high degree of wealthiness, also have ultra high reserves (and per capita) e.g. Switzerland, Hong Kong, Singapore, Saudi Arabia
- Resources/commodities rich and exporters also have high reserves e.g. Saudi Arabia, Brazil and Russia.
In addition to Forex, NIIP is also an important indicator to differentiate countries into the two camps of those hold credits, and those in debt. In the above 11 countries, 10 are positive in NIIP i.e. creditiors.
@Edison Chen might have more data to add.