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Revision 1996 10 new jobs were added. Revision 1999 Almost all jobs were included with exceptions Revision 2004 Manufacturing jobs were included Revision 2007 The length of contract was extended from one to three years for manufacturing jobs. Revision 2012 New conditions were added to mitigating the adverse social consequences for haken workers. Revision 2015 New conditions were added to improve equality between haken and other types of workers and contract lengths were limited to three years for all specified jobs