Year	days
2004	4
2005	4
2006	4
2007	4
2008	4
2009	4
2010	4
2011	3.5
2012	3.5
2013	3.5
2014	3.5
2015	3.5
2016	3.5
2017	3.5
2018	3.5
2019	3.5