Pressing Enter creates a double row line space in Word 2007 Table

I have a word document that someone else created and it contains a fairly large table.

To keep the page count down, I would like to change the contents of the table to be a single line spaced rather than double line spaced. If I press enter within the cell of the table, it creates a double line.

How do I change it to where the line space is single? I have attached the document if you would like to see what I am working with.
 file.docx