Year	days
2003	39.803030303030305
2004	33.94117647058823
2005	27.485294117647058
2006	24.87142857142857
2007	22.414285714285715
2008	19.12857142857143
2009	17.82857142857143
2010	16.87142857142857
2011	15.014285714285714
2012	14.371428571428572
2013	12.414868421052631
2014	11.333289473684209
2015	10.517499999999998
2016	10.096447368421051
2017	10.096447368421053
2018	10.043815789473685
2019	9.480657894736842