Import Google spreadsheet to post

I have a draft that I would like to import a Google spreadsheet, so that the post will be updated every time I update the spreadsheet.

I have done this in the past on a previous blog, but must have forgotten how to do it, because it isn`t working this time.
Despite I post the URL to the sheet as a published webpage and add this code using the HTML editor all I get is a link thereto.

Can someone please tell me how to do this?