Year	days
2003	490.3333333333333
2004	471.8888888888889
2005	445.05263157894734
2006	447.2
2007	448
2008	445.25
2009	443.23809523809524
2010	443.23809523809524
2011	464.76190476190476
2012	457.1904761904762
2013	465.3636363636364
2014	463.09090909090907
2015	471.1818181818182
2016	473.90909090909093
2017	473.90909090909093
2018	473.90909090909093
2019	473.95454545454544