Year	days
2003	538.9512195121952
2004	524.4285714285714
2005	508.74418604651163
2006	500.1111111111111
2007	500.46666666666664
2008	506.1304347826087
2009	507.3404255319149
2010	509.468085106383
2011	524.1489361702128
2012	526.0208333333334
2013	539.5510204081633
2014	555.6734693877551
2015	553.795918367347
2016	558.1020408163265
2017	558.1020408163265
2018	559.74
2019	559.76