Year	days
2003	38.91304347826087
2004	42.375
2005	42.583333333333336
2006	45.32
2007	42.4
2008	41.46
2009	39.18
2010	36.22
2011	32.6
2012	33.69230769230769
2013	34.65344827586207
2014	30.877241379310348
2015	27.715862068965517
2016	25.736206896551725
2017	25.054827586206898
2018	23.403448275862072
2019	22.89103448275862