Simple Add a word, search engine indexed multiplied

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Do the station to do a few months, search engines are always not many, also not too much, because this site is a free statistical service station, thinking that the page is not much, it should be normal? But look at some other similar sites, included are a lot of. Can not find the reason, and then inadvertently will users see the title of the Statistics page added a corresponding site name, that is, such as: XXX website-statistical reports, after a period of operation, included multiplied, Baidu included from 200 to more than 1500, Google recorded from 1000 to more than 3,000, Yahoo included from 700 to more than 1600, just sogou unchanged (do not know what the reason), (specific data can be found in: http://www.zzstat.com/view_seo_l.php?id=1). Why is there a big boost? I think the search engine may be in the collection page is to determine the title of a website page, if the same as the title, may not matter whether the actual content, are considered a page, and the title added to the personality, will be considered different. A little experience, said the wrong place, but also please criticize.