²²The investment data (“Gross capital formation as percent of GDP” series code = ne.gdi.totl.zs) is the 14th of October 2015 version of the World Bank development indicators (accessed on the 12th of November 2015), except for Lithuania, where we use the 14 April 2015 release of the indicators (accessed 26 June 2015) because the October release does not include data for Lithuania prior to 2004.