For the first time in 1996, the IEA produced a compilation of its most used statistics in a booklet easily accessible to all – what is now the annual Key World Energy Statistics (KWES). Since then, the booklet has been hugely successful and has become a constant companion of energy analysts and policy makers. Key World Energy Statistics contains timely, clearly presented data on the supply, transformation and consumption of all major energy sources for the main regions of the world.