Hi Peter,

Thank you for your comment.

Initially, I also read several articles linking to one another. Although I couldn’t find a research paper, I found some links here: http://answers.google.com/answers/threadview/id/149262.html

I’m not sure how reliable they are. But I guess we can take the number with a grain of salt. Either this study is not publicly available or it’s not very accurate.

Cheers,

Prakhar