Chart of estimated worldwide annual supply of industrial robots (in units) (1998-2015)

Reference 1: supply.

Reference 2: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013, 2014 and 2015.

Source: http://en.wikipedia.org/wiki/Industrial_robot