user: Question: How many figures are given for the New Democratic for the polling range May 11–31, 2010?
Columns: ['Polling Firm', 'Date of Polling', 'Link', 'Progressive Conservative', 'Liberal', 'New Democratic']
Types: ['text', 'text', 'text', 'real', 'real', 'real']
Sample row: ['Corporate Research Associates', 'September 29 – October 3, 2011', 'HTML', 59.0, 16.0, 25.0]
SQL:

assistant: SELECT COUNT("New Democratic") FROM "Table" WHERE "Date of Polling" = 'May 11–31, 2010';