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Date of Survey

Successful Sample Response Rate

13/10/2010

1020 66.9%

14/10/2009

1007 71.9%

15/10/2008

1011 74.9%

10/10/2007

1023 69.9%

11/10/2006

1027 60.7%

12/10/2005

914 66.1%