Provided that you respect some basic SEO guidelines, 100% of your posts should be indexed by Google. The basic SEO guidelines are:
1. All your posts must have unique and quality content. By unique I mean that the content of your posts should be found only on a single place (i.e., avoid duplicate content both inside and outside your domain). By quality I mean that the content should be useful to potential visitors. If you repeat the letter “z” one thousand times you would end up with unique content, but it would have zero quality so Google would probably not index that.