samkhan 98% do-follow links and 2% no-follow links.
I have not read any blog or announcements by search engines about numbers of No-follow and Do-follow links
This ratio It's not possible
There is 95 % dofollow and 5% no follow links are compulsory to rank up your website
Hey if you want to rank high on google it should be around 75% do-follow and 25% no-follow.
(MOD: link removed -- further spamming may result in immediate suspension of your account.)
Around 75% dofollow and 25% no follow links you need to get higher rank in Google SERP.
And having a lot of nofollow links will give you more leeway to get after follow link.
So, though there is no official comment on a good dofollow : nofollow ratio from Google: A few webmasters I know, follow 60:40 ratio.
There should be 89% dofollow links and 11% nofollwo links for best seo.