Table:
text: Newfoundland and Labrador general election, 2011
Opinion polls
Opinion polls
Polling_Firm Date_of_Polling Link Progressive_Conservative Liberal New_Democratic
Corporate Research Associates May 11–31, 2010 PDF 75 16 8
Corporate Research Associates February 9–25, 2010 PDF 80 15 5
Corporate Research Associates November 5–22, 2009 PDF 77 16 7
Corporate Research Associates August 11–29, 2009 PDF 77 15 8
Corporate Research Associates May 12–30, 2009 PDF 72 19 8
Corporate Research Associates February 11–28, 2009 PDF 71 22 7
Corporate Research Associates November 5 – December 2, 2008 PDF 72 19 9
Corporate Research Associates August 12–30, 2008 PDF 78 14 7
Corporate Research Associates May 8 – June 1, 2008 PDF 77 13 8
Corporate Research Associates February 12 – March 4, 2008 PDF 79 14 6
Corporate Research Associates November 9 – December 3, 2007 PDF 82 12 7

Question: How many numbers are given for the New Democratic for the May 11-31, 2010 election period in the 2011 Newfoundland and Labrador general election?