Data refer to the working-age population (18-65). Data refer to 2011-14 for all countries except Switzerland (2009-12), Germany, Ireland, Japan and the United Kingdom (2010-13), Turkey (2008-11), Canada (2007-10) and Chile (2006-09). For the United States, as data is collected on a biannual basis, the result is based on the average between results for a 3 year- and a 5 year-panel.