Year	days
2003	51.56716417910448
2004	48.53125
2005	50.785276073619634
2006	47.91017964071856
2007	43.38529411764706
2008	40.0233918128655
2009	37.80523255813954
2010	36.01453488372093
2011	31.951149425287355
2012	31.43258426966292
2013	26.850211640211644
2014	24.36952380952381
2015	23.472894736842107
2016	23.075368421052634
2017	21.5623947368421
2018	20.564659685863873
2019	19.659031413612567