2007/01 MEAN = 27.02 STDEV = 0.07 Data Points = 12 2007/02 MEAN = 26.99 STDEV = 0.01 Data Points = 4 2007/03 MEAN = 27.01 STDEV = 0.02 Data Points = 6 2007/04 MEAN = 27.02575 STDEV = NA Data Points = 1 2007/05 MEAN = NA STDEV = NA Data Points = 0 2007/06 MEAN = 27.04 STDEV = 0.02 Data Points = 2 2007/07 MEAN = 27.02 STDEV = 0.0 Data Points = 2 2007/08 MEAN = NA STDEV = NA Data Points = 0 2007/09 MEAN = 27.0 STDEV = 0.01 Data Points = 4 2007/10 MEAN = 27.02 STDEV = 0.01 Data Points = 2 2007/11 MEAN = NA STDEV = NA Data Points = 0 2007/12 MEAN = NA STDEV = NA Data Points = 0 2008/01 MEAN = 27.0 STDEV = 0.03 Data Points = 14 2008/02 MEAN = 26.96 STDEV = 0.02 Data Points = 8 2008/03 MEAN = 26.97 STDEV = 0.03 Data Points = 13 2008/04 MEAN = 27.07 STDEV = 0.02 Data Points = 6 2008/05 MEAN = 27.02 STDEV = 0.04 Data Points = 4 2008/06 MEAN = NA STDEV = NA Data Points = 0 2008/07 MEAN = NA STDEV = NA Data Points = 0 2008/08 MEAN = 27.0 STDEV = 0.06 Data Points = 8 2008/09 MEAN = 26.99 STDEV = 0.02 Data Points = 3 2008/10 MEAN = 26.99 STDEV = 0.02 Data Points = 2 2008/11 MEAN = 26.97 STDEV = 0.13 Data Points = 4 2008/12 MEAN = NA STDEV = NA Data Points = 0 2009/01 MEAN = NA STDEV = NA Data Points = 0 2009/02 MEAN = NA STDEV = NA Data Points = 0 2009/03 MEAN = NA STDEV = NA Data Points = 0 2009/04 MEAN = NA STDEV = NA Data Points = 0 2009/05 MEAN = 27.05 STDEV = 0.01 Data Points = 2 2009/06 MEAN = NA STDEV = NA Data Points = 0 2009/07 MEAN = 27.08 STDEV = 0.01 Data Points = 2 2009/08 MEAN = 27.07 STDEV = 0.07 Data Points = 4 2009/09 MEAN = 27.02 STDEV = 0.03 Data Points = 5 2009/10 MEAN = 27.0746666667 STDEV = NA Data Points = 1 2009/11 MEAN = 27.02 STDEV = 0.03 Data Points = 5 2009/12 MEAN = 26.97 STDEV = 0.01 Data Points = 2 2010/01 MEAN = 27.04 STDEV = 0.03 Data Points = 10 2010/02 MEAN = 27.02 STDEV = 0.09 Data Points = 5 2010/03 MEAN = 27.06 STDEV = 0.02 Data Points = 7 2010/04 MEAN = 26.99 STDEV = 0.03 Data Points = 3 2010/05 MEAN = 27.13 STDEV = 0.0 Data Points = 2 2010/06 MEAN = NA STDEV = NA Data Points = 0 2010/07 MEAN = 27.0 STDEV = 0.02 Data Points = 2 2010/08 MEAN = NA STDEV = NA Data Points = 0 2010/09 MEAN = NA STDEV = NA Data Points = 0 010/10 MEAN = 26.98 STDEV = 0.0 Data Points = 2 2010/11 MEAN = 27.02 STDEV = 0.0 Data Points = 2 2010/12 MEAN = NA STDEV = NA Data Points = 0 2011/01 MEAN = 26.98 STDEV = 0.03 Data Points = 3 2011/02 MEAN = 27.0 STDEV = 0.02 Data Points = 3 2011/03 MEAN = 27.0 STDEV = 0.05 Data Points = 9 2011/04 MEAN = 26.93 STDEV = 0.01 Data Points = 2 2011/05 MEAN = 27.08 STDEV = 0.01 Data Points = 2 2011/06 MEAN = NA STDEV = NA Data Points = 0 2011/07 MEAN = 26.99 STDEV = 0.05 Data Points = 7 2011/08 MEAN = NA STDEV = NA Data Points = 0 2011/09 MEAN = 26.94 STDEV = 0.03 Data Points = 2 2011/10 MEAN = 26.95 STDEV = 0.05 Data Points = 4 2011/11 MEAN = 27.63 STDEV = 0.0 Data Points = 2 2011/12 MEAN = 27.63 STDEV = 0.08 Data Points = 12 2012/01 MEAN = 27.68 STDEV = 0.08 Data Points = 4 2012/02 MEAN = 27.73 STDEV = 0.01 Data Points = 8 2012/03 MEAN = NA STDEV = NA Data Points = 0