http://en.m.wikipedia.org/wiki/Decimal_mark

Style    Countries
1234567,89    SI style (French version), Albania, Austria, Belgium, Bosnia, Brazil, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latin Europe, Lithuania, Netherlands (non-currency numbers, see below), Poland, Portugal, Romania, Russia, Serbia, Slovakia, Slovenia, South Africa, Spain, Sweden
1234567.89    SI style (English version), Australia, Canada, China
1,234,567.89    China, Ireland, Israel, Japan, Korea, Malaysia, Mexico, New Zealand, Philippines, Singapore, Taiwan, Thailand, United Kingdom, United States
1,234,567·89    Ireland, Japan, Korea, Malaysia, New Zealand, Philippines, Singapore, Taiwan, Thailand, United Kingdom, United States (older, typically hand written)
1.234.567,89    Austria, Brazil, Denmark, Germany, Greece, Indonesia, Italy, Netherlands (currency), Portugal, Romania, Russia, Slovenia, Spain (older),[18] Sweden (not recommended)
1˙234˙567,89    Italy (handwriting)
12,34,567.89    India (see Indian Numbering System)
1'234'567.89    Switzerland (printed, computing, currency, international requisite, everyday use)
1'234'567,89    Switzerland (handwriting)
1.234.567'89    Spain (handwriting)
123,4567.89    China (alternative), Japan (alternative)