Humana Sees Earns at Top End of Forecast  NEW YORK (Reuters) - Health insurer Humana Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=HUM.N target=/stocks/quickinfo/fullquote"&gt;HUM.N&lt;/A&gt; on  Wednesday said earnings for 2004 should be at the top end of  its previous forecast and said 2005 earnings should increase by  15 percent from its 2004 estimate.