Further information on the national data sources and earnings concepts used in the calculations can be found at: uiuiur.oecd.org/employment/outloofe. The first available year is 2005 for Poland, 2004 for Greece, Iceland, Spain and Portugal, 2002 for the Slovak Republic, and 2001 for Israel. The latest available year is 2011 for Canada, Hungary, Japan, Korea, Norway, the United Kingdom and the United States, and 2005 for the Netherlands.