Google reveals index secrets: Charts indexing of your site over time
from Search Engine Land
Google webmaster tools launched Index Status that charts the number of indexed pages for your site over the last year. Google says that this count is accurate and is post-canonicalization. You can also get this data by submitting XML Sitemaps but you'll only see complete indexing numbers if your Sitemaps are comprehensive. Google also charts this data over time for the past year.
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