Insert blank row after duplicate account number

Hi All- I have data that looks like this:

Acct
123
123
234
345
456
456
456
567

I would like to insert a blank row after each group of accounts so that the data will look like this:

Acct
123
123

234

345

456
456
456

567

I am relatively new to VBA, but I know there is a way to create this loop. I just haven't been able to find it yet. Any suggestions?

Thanks - that wokred.