Auto data separation

I have a dump of 2,000 lines (running in Excel 2003) which have a column of account codes (around 100), a column of invoice numbers, and a column of values.

I want to be able to split the dump into the account codes, one per sheet. I've tried to do it with formula but failed, tried with code but failed (but as I am the worst writer of VBA in the world that wasn't suprising). Can anyone suggest the approach I should take.

A sample spreadsheet is attached.

thanks for any ideas