Insering empty rows after each

Hello,

I have a sheet continously populated with rows.
What I would like to manage is to insert empty lines after each row, so that I have one data-row then one empty row, something like this:
as is
data1
data2
.
data n

to be
data1
empty
data2
empty
.
data n

The list begins on a fix row, but the number of the rows may vary.
Can anybody advice, how to manage it?

Many thanks