The Fifth Division of the U.S. Army wants to forecast personnel costs for the next 5 years. A search of the records reveals the accompanying data. Using these data, forecast personnel costs for 2012, 2013, 2014, 2015, and 2016. Place 90% confidence limits around these estimates.

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Year 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 Costs (thousands) 51,576 49,015 40,845 34,497 28,625 25,376 21,163 18,468 14,992 13,633 12,069 11,452 10,321 9,329 7,982 7,877 7,648 7,071 6,411 5,409 4,657 4,017