That index fell by -3.20% in June, its first negative month since June 2013.
The recent fall has not made a big dent in the 2015 year-to-date performance which remains strong at +17.72%.
Ireland with its 17 companies in the index was the best performing nation with an average fall of 1.53%.
Perhaps unsurprisingly Greece tops the charts for the wrong reason with average falls of -6.72%, and less expected, Sweden delivered the next weakest performance with a -6.43% overall fall.
In terms of sector performance, retail was the best losing just 1.18% overall, followed by technology which fell 2.49%.
The worst performing sector was natural resources which lost -5.42% overall followed by industrial goods which dipped -4.4%.
The Index Series currently comprises 1350 companies across 16 European countries.