Year	number
2005	12.555555555555555
2006	13.777777777777779
2007	14.1
2008	14.1
2009	14.1
2010	14.1
2011	13.545454545454545
2012	14.090909090909092
2013	14.090909090909092
2014	14.090909090909092
2015	14.090909090909092
2016	14.090909090909092
2017	14.090909090909092
2018	14.090909090909092
2019	14.090909090909092