http://sugarpeach.wordpress.com/2012/ would be the permalink for the 2012 yearly archive page, that is why the -2 was added. It it was not, then the two pages would be in conflict with one another since the archive page and the page you created would have the same permalink.
You are welcome. What you would have to do is to put some text with the year rather than just having it as the number. The other thing you can look at would be replacing the zero with a captital O. You would have to see how it looked as some fonts make numbers smaller than capital letters.