Year	days
2003	57.44117647058823
2004	50.575
2005	58.54545454545455
2006	54.47826086956522
2007	49.04347826086956
2008	43.21739130434783
2009	40
2010	37.47826086956522
2011	27.347826086956523
2012	26
2013	23.958333333333332
2014	22.833333333333332
2015	24.06
2016	23.5
2017	22.78
2018	23.16
2019	22.36