Year	days
2004	81.3
2005	65.05
2006	84.95833333333333
2007	80.11538461538461
2008	76.75
2009	61.17857142857143
2010	60.766666666666666
2011	53.71875
2012	51.44117647058823
2013	50.85294117647059
2014	50.14705882352941
2015	49.26470588235294
2016	49.26470588235294
2017	49.411764705882355
2018	48.1764705882353
2019	46.411764705882355