"Figure 2: Using the “cohort split” approach smooths the attainment data","" "Comparing the attainment data series using new data sources, with and without the “cohort split” approach, England, academic years ending 1996 to 2018","" "","" "Notes","1. The data sources outlined in section 2 have been used in this chart – the threshold measure used from academic years ending 2009 to 2017 now is the series that includes English and maths, and for the academic year 2017 to 2018 we have used Attainment 8. 2. These data are for England only." "Unit","Index" "","" "","Old approach","'Cohort split' approach" "1995/6","100","100" "1996/7","101.5","102.4" "1997/8","104.9","105.3" "1998/9","108.4","107.7" "1999/0","110.8","109.6" "2000/1","111.9","111.7" "2001/2","114.5","114.3" "2002/3","116.9","117.2" "2003/4","118.3","120.8" "2004/5","123.3","125.5" "2005/6","127.2","130.6" "2006/7","132.2","136.1" "2007/8","137.2","141.7" "2008/9","143.6","147.3" "2009/10","153.2","151.5" "2010/11","158.3","152.8" "2011/12","157.9","152.6" "2012/13","157.9","152.6" "2013/14","157.9","152.5" "2014/15","156.2","152.6" "2015/16","157.6","153.6" "2016/17","159.3","154.3" "2017/18","159.6","154.5"