Year	number
2005	36.55555555555556
2006	36.55555555555556
2007	34.7
2008	35.8
2009	35.8
2010	35.8
2011	35.09090909090909
2012	35.09090909090909
2013	35.09090909090909
2014	35.09090909090909
2015	35.18181818181818
2016	36.27272727272727
2017	36.36363636363637
2018	35.36363636363637
2019	35.27272727272727