Google has released a very useful tool through their Webmaster Tools platform.
You can now visually see the indexing of your domains right from this platform.
Google has added this new feature in the Health Menu. Google spoke about it:
It shows how many pages are currently indexed. The legend shows the latest count and the graph shows up to one year of data. If you see a steadily increasing number of indexed pages, congratulations! This should be enough to confirm that new content on your site is being discovered, crawled and indexed by Google. However, some of you may find issues that require looking a little bit deeper. That’s why we added an Advanced tab to the feature. The advanced section will show not only totals of indexed pages, but also the cumulative number of pages crawled, the number of pages that we know about which are not crawled because they are blocked by robots.txt, and also the number of pages that were not selected for inclusion in our results.