Those are meaningless statistics on their own and without context. Iceland is big in banking and if a foreign entity deposits a million Dollars into an Icelandic bank then Iceland's foreign debt increases by one million Dollars. By those statistics every singe Luxembourgian citizen owes more then $3 million to foreigners...
As the article says: "Note that while a country may have a relatively large external debt (either in absolute or per capita terms), it could be a "net international creditor" if its external debt is less than the total of the external debt of other countries held by it. For example, Norway, Luxembourg, Switzerland, China and others are net international creditors."
