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Date of Survey

Instant/First follow-up survey/Second follow-up survey

Successful Sample

Response Rate

Standard Error

10-16/3/2011

Second follow-up survey

1009

65.6%

1.6%

24-25/2/2011

First follow-up survey

515

72.6%

2.2%

23/2/2011

Instant survey

1031

72.8%

1.6%

23-25/3/2010

Second follow-up survey

1012

69.3%

1.6%

25-27/2/2010

First follow-up survey

517

67.1%

2.2%

24/2/2010

Instant survey

1008

65.9%

1.6%

17-18/3/2009

Second follow-up survey

1007

63.3%

1.6%

26/2/2009

First follow-up survey

525

66.5%

2.2%

25/2/2009

Instant survey

1015

67.7%

1.6%

12-14/3/2008

Second follow-up survey

1017

65.8%

1.6%

28/2/2008

First follow-up survey

525

70.1%

2.2%

27/2/2008

Instant survey

1077

75.5%

1.5%

19-21/3/2007

Follow-up survey

1007

63.6%

1.6%

28/2/2007

Instant survey

1018

65.2%

1.6%

13-17/3/2006

Follow-up survey

1010

59.4%

1.6%

22/2/2006

Instant survey

1026

68.3%

1.6%

11-14/4/2005

Follow-up survey

1009

62.8%

1.6%

16/3/2005

Instant survey

1041

65.2%

1.5%

22-24/3/2004

Follow-up survey

1015

67.8%

1.6%

10/3/2004

Instant survey

1023

64.7%

1.6%

12-13/3/2003

Follow-up survey

1040

72.3%

1.6%

5/3/2003

Instant survey

1047

71.4%

1.5%

18-20/3/2002

Follow-up survey

1216

60.1%

1.4%

6/3/2002

Instant survey

1041

59.9%

1.5%

30-31/3/2001

Follow-up survey

511

73.3%

2.2%

7-8/3/2001

Instant survey

502

67.1%

2.2%

20/3/2000

Follow-up survey

660

56.7%

2.0%

8/3/2000

Instant survey

856

56.4%

1.7%

18/3/1999

Follow-up survey

530

55.4%

2.2%

3/3/1999

Instant survey

1190

62.1%

1.4%

24/2/1998

Follow-up survey

538

56.7%

2.2%

18/2/1998

Instant survey

804

54.7%

1.8%