color from 2015 group if no group in 2008
color from 2015 group if no group in 2008

libe-sixplus/un-concentre-de-presse-ecrite,libedata/un-concentre-de-presse-ecrite,libedata/un-concentre-de-presse-ecrite,libe-sixplus/un-concentre-de-presse-ecrite