Testing testing: geography skills

Which of these geographical areas is the odd one, the one that does not belong?

Finland (FI)	48
Spain (ES)	26
United States (US)	6
Denmark (DK)	2
United Kingdom (GB)	2
Aland Islands (AX)	1
Sweden (SE)	1
Slovakia (SK)	1
Canada (CA)	1
Slovenia (SI)	1
Peru (PE)	1
Poland (PL)	1