KMart Same-Store Sales Fall 4.6 Percent  NEW YORK (Reuters) - Kmart Holding Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=KMRT.O target=/stocks/quickinfo/fullquote"&gt;KMRT.O&lt;/A&gt; on Monday  said sales at stores open at least a year fell 4.6 percent in  the November-December period -- an improvement from declines  earlier in the year.