As long as you don't have no index on your pages, Google eventually crawls them all, however depending on what you do some may take longer than others
more than 90% of my website pages has been indexed in google and being indexed. I can say that its better to submit a sitemap to google webmastertools to help google to find our pages easily and efficiently (as soon as new page published in our website).
Almost all the pages of the website are indexed by google. If you are having some problem related to the page indexing then you need to update your XML site map.