Amstelland Arcadis Ballast Nedam Fugro Geveke Grontmij Heijmans Holl. Beton Groep IHC Caland Imtech BAM NBM Boskalis Westminster Volker Wessels Stevin 00 00 00 00 00 00 00 00 00 00 00 00 00 0,30 0,39 1,13 1,36 1,90 1,73 1,00 0,73 1,36 1,20 1,15 1,05 1,25