I reckon it's to do with the site having more members than a year ago so the quality of other members would either increase or decrease therefore changing where you lie in relation to the other members
Has the rating system changed since 1 year ago?

This took place in October of 2014: http://www.chess.com/forum/view/livechess/standard-ratings-boost
When I finished playing on chess.com more than a year ago, my percentile in standard live was 99% at my peak rating of 1725.
These days my new site was down several times so I reluctantly decided to play a few games here again. My rating has risen yet my percentile dropped. Now it is 97.8% at the rating 1809.
When I was active I was a typical 1680-90 player and it took me months to struggle above 1700. 1760s seemed formiddable and I was happy if I could draw some of them.
Now that I returned I went above 1800, an almost 100 point rise in a matter of six games or so. 1760s now seem pretty lame.
Has the rating system changed since one year ago ( no longer starting at 1200 ) or has there been a huge inflation in standard live ratings since then, otherwise I don't understand what's going on.
ps.
I'm glad that now my standard live rating is shown when hovering over my profile. I didn't like my correspondence rating being shown, since correspondence is rather inflated and 1800 in correspondence is not that great a rating.