Table 1. Survey statistics of the three surveys.

	Dec05	Jun06	Oct07
Total sample	9132	9139	6155
Total attempted	8574	8808	5837
Others	359	439	2294
Revised (Attempted-Others)	8215	8369	3543
Completed survey	975(12%)	1418(17%)	1232(35%)
Assumed open	1173(14%)	1867(22%)	1101(31%)
Disconnected	1259 (15%)	2376(28%)	170(5%)
No answer	4808(59%)	2708(32%)	1040(29%)

Note: The percentage values were computed using “Revised” (Total attempted minus Others) as denominator. (Note: “Others” include “no eligible respondent”, “incorrect business”, and “not a business.”; whereas “Assumed open” include “hard or soft refusal”, “busy”, “call back”, “fax”, “already taken survey”, “partially completed”, and “mail back”.)