▁rev ital ised ▁within ▁the ▁European ▁Union ▁when ▁it ▁was ▁proposed ▁by ▁Sweden ▁in ▁ 2 0 0 3 ▁amid ▁negoti ations ▁on ▁the ▁Amsterdam ▁Tre aty ▁and ▁by ▁Poland ▁June ▁ 2 0 0 7 ▁during ▁sum mit ▁on ▁the ▁Tre aty ▁of ▁Lis bon . ▁In ▁this ▁context , ▁the ▁method ▁was ▁proposed ▁to ▁compute ▁voting ▁weights ▁of ▁member ▁states ▁in ▁the ▁Council ▁of ▁the ▁European ▁Union . ▁ ▁Currently , ▁the ▁voting ▁in ▁the ▁Council ▁of ▁the ▁EU ▁does ▁not ▁follow ▁the ▁Pen rose ▁method . ▁Instead , ▁the ▁rules ▁of ▁the ▁Nice ▁Tre aty ▁are ▁effective ▁between ▁ 2 0 0 4 ▁and ▁ 2 0 1 4 , ▁under ▁certain ▁conditions ▁until ▁ 2 0 1 7 . ▁The ▁associated ▁voting ▁weights ▁are ▁compared ▁in ▁the ▁adjacent ▁table ▁along ▁with ▁the ▁population ▁data ▁of ▁the ▁member ▁states . ▁ ▁Besides ▁the ▁voting ▁weight , ▁the ▁voting ▁power ▁( i . e ., ▁the ▁Pen rose – B anz h af ▁index ) ▁of ▁a ▁member ▁state ▁also ▁depends ▁on ▁the ▁threshold ▁percentage ▁needed ▁to ▁make ▁a ▁decision . ▁Sm aller ▁percent ages ▁work ▁in ▁favor ▁of ▁larger ▁states . ▁For ▁example , ▁if ▁one ▁state ▁has ▁ 3 0 % ▁of ▁the ▁total ▁voting ▁weights ▁while ▁the ▁threshold ▁for ▁decision ▁making ▁is ▁at ▁ 2 9 %, ▁this ▁state ▁will ▁have ▁ 1 0 0 % ▁voting ▁power ▁( i . e ., ▁an ▁index ▁of ▁ 1 ). ▁For ▁the ▁EU - 2 7 , ▁an ▁optimal