| Year | Yes, enough | No, not enough | No opinion |
|---|---|---|---|
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
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Source
Release date
December 2009
Region
United States
Survey time period
April 6 to 9, 2009
Number of respondents
676 respondents
Age group
18 years and older
Method of interview
Telephone interview
Supplementary notes
* Exact dates of survey for years previous to 2009 are unavailable.
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