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Date of Survey

Successful Sample Response Rate Standard Error

11-18/3/2013

1023 69.9% 1.6%

28/2-1/3/2013

520 66.0% 2.2%

27/2/2013

1024 67.3% 3%

7-9/3/2012

1010 65.8% 1.6%

2-3/2/2012

504 63.7% 2.2%

1/2/2012

1015 71.1% 1.6%

24-25/2/2011

515 72.6% 2.2%

23/2/2011

1031 72.8% 1.6%

25-27/2/2010

517 67.1% 2.2%

24/2/2010

1008 65.9% 1.6%

26/2/2009

525 66.5% 2.2%

25/2/2009

1015 67.7% 1.6%

28/2/2008

525 70.1% 2.2%

27/2/2008

1077 75.5% 1.5%

28/2/2007

1018 65.2% 1.6%

22/2/2006

1026 68.3% 1.6%

16/3/2005

1041 65.2% 1.5%

10/3/2004

1023 64.7% 1.6%

5/3/2003

1047 71.4% 1.5%

6/3/2002

1041 59.9% 1.5%

7-8/3/2001

502 67.1% 2.2%

8/3/2000

856 56.4% 1.7%

3/3/1999

1190 62.1% 1.4%

18/2/1998

804 54.7% 1.8%