from 11/16/2011 48  
to 1/2/2012 1
 
from 1/2/2012 48  
to 2/18/2012 2
from 2/18/2012 48   
to 4/5/2012 3
from 4/5/2012 48  
to 5/22/2012 4
from 5/22/2012 48  
to 7/8/2012 5
from 12/1/2010 50  
to 1/19/2011 6