January 2011 55.8
February 2011 56.7
March 2011 55.7
April 2011 56.0
May 2011 51.8
June 2011 49.8
July 2011 48.2
August 2011 49.7
September 2011 47.3
October 2011 50.1
November 2011 48.5
December 2011 48.6
January 2012 48.3
February 2012 49.7
March 2012 51.5
April 2012 50.1
May 2012 51.2
June 2012 53.1
July 2012 53.9
August 2012 50.9
September 2012 51.8
October 2012 52.1
November 2012 52.4
December 2012 51.4
January 2013 50.3
February 2013 51.5
March 2013 48.6

Source: NTC Research * Readings above 50 indicate growth, below 50 contraction