SearchEngineWatch names up to date figures about the comprehensiveness of Google Encrypted Search, search within Google owned site without data being provided to protect the privacy of users. The data is provided by Conductor, a seo solution provider.
According to these figures, which differ to numbers provided by other seo companies more or less, after an increase since the announcement in October by Google a consolidation has followed. Now an average of 9 % of all searches happens without data being published. This result is based on the survey and comparison of five sites since the Google announcement done by Conductor.
An exception to the encryption by the way is available to AdWords users. Furthermore the article cites and names ways to get reliable data despite the encryption.