Measurement period	Response rate
February 2011
Mail	17.1% (60,320)
Mail, Phone, Web	21.7% (74,995)
May 2011
Mail	19.1% (71,879)
Mail, Phone, Web	23.5% (88,461)
Phone
July 2011
Mail	17.9% (67,478)
Mail, Phone, Web	22.0% (83,174)
November 2011
Mail	20.3% (98,717)
Mail, Phone, Web	25.1% (121,940)