sentences:  IBL publishes an annual Index that aims to shed light on the degree of openness of the 28 Member States by examining ten different economic sectors, which include petrol and diesel retail, electricity, natural gas, labour markets, postal services, telecommunications, broadcasting, air transport, rail transport and insurance.Media and academicians cite the annual index as a source of information for policy-making and research.First published in 2007, the IBL Index of Liberalizations has greatly evolved over the years.