Year	days
2004	91.17
2005	88.5
2006	77.66379310344827
2007	72.26724137931035
2008	61.327586206896555
2009	50.37068965517241
2010	46.456896551724135
2011	44.19491525423729
2012	42.02542372881356
2013	38.71292307692307
2014	36.804
2015	36.027076923076926
2016	38.21869230769231
2017	37.098846153846154
2018	37.308692307692304
2019	37.78584615384615