Review the data in the table and answer the following question.
Year Average Length of Stay
2004 23.41
2005 23.31
2006 33.21
2007 35.21
2008 29.31
2009 25.31
2010 21.41
2011 33.21
2012 19.41
You are creating a report on the average length of stay (ALOS) at a rehabilitation hospital. What is the range of this set of ALOS?