June 2010 - closed 6th September 2010
Respondents: 691
December 2009 - closed 10th March 2010
Respondents: 644
September 2009 - closed 8th December 2009
Respondents: 640
June 2009 - closed 10th September 2009
Respondents: 530
March 2009 - closed 16th June 2009
Respondents: 448
December 2008 - closed 17th March 2009
Respondents: 731
September 2008 - closed 12th December 2008
Respondents: 543
