After completing a spreadsheet in Open Office, I realize I need to double space the rows. How do I do this?

Using Open Office, I made a spreadsheet for my mother with people's names, addresses, telephone numbers, and birthdays in each row. After I finished, she told me it looked okay but she wants it to be double spaced. I suppose I could insert an empty row between each existing row in order to do this, but there are 115 entries on this list, and it would be very tedious to do this by hand. Is there some easy, automatic way to insert an empty row between each existing row or to at least cause it to print out double spaced?