Google has made a public index secret that charts the number of indexed pages for your site over the last year using the new Index Status feature in Webmaster Tools
To see Index Status go to Webmaster Tools > Health > Index Status
It gives you an idea about how many pages are presently indexed. If you see a progressively increasing number of indexed pages, many happy returns! It should be sufficient to verify that new content on your site is being crawled and indexed by Google.
1 => For Basic Tab
Total Indexed: The total number of URLs from your site that have been added to Google's index.
=> For Advanced Tab: This Advanced alternative give extra information:
Ever crawled: The cumulative total of URLs from your site that Google has ever accessed.
Not selected: URLs from your site that redirect to other pages or URLs whose contents are substantially similar to other pages.
Blocked by robots: URLs Google could not access because they are blocked in your robots.txt file.