The Alerian index is setting new highs on an almost daily basis.
^AMZX now over 1440 (the index started at 100 in 1997).
Only 3 (!!!) MLPs are down YTD, two of those by just a few percent.
OXF is the only MLP down significantly in 2013.
There are a whole bunch of MLPs up 30% YTD.
I see someone gave you a thumbs down just for asking a question.
Anyway, a lot of stats are compiled by Hinds Howard in his weekly blog on the mlpguy website.
Each week he posts some stats on the week and y-o-y and YTD performance.
Alternately, the index I refer to (Alerian MLP total return index) has ticket ^AMZX and can get quotes like any ticker. And the entire daily historical prices of that index are maintained in a spreadsheet on the Alerian website.