Year	days
2004	57.3
2005	57
2006	57
2007	55.27272727272727
2008	44.90909090909091
2009	43.18181818181818
2010	43.18181818181818
2011	43.18181818181818
2012	43.18181818181818
2013	40.90909090909091
2014	38.45454545454545
2015	38.36363636363637
2016	40.09090909090909
2017	40
2018	38.04545454545455
2019	37.54545454545455