Google supplemental index

Google hides what pages are in there supplemental index, but before they did I always had more than 100 pages in there supplemental index. It's really hard to find out which pages have been moved to the supplemental listing. A huge reduction in page rank is an indication, but loss of page reduction is evidence that a page has moved to the supplemental index.

Why, well any new page I make is a copy and paste of an existing page. If I don't up-date the Title, description, or page contents then the new page appears to be a copy of another page ~ no page rank ~ I check for duplicate content most time, but it depends on the up-date I'm making.