Year	days
2003	603.9090909090909
2004	589
2005	585.1176470588235
2006	572.4285714285714
2007	568.1428571428571
2008	570.4571428571429
2009	574.3142857142857
2010	577.1714285714286
2011	583.9714285714285
2012	589.6285714285714
2013	587.6565789473684
2014	603.0513157894737
2015	604.103947368421
2016	608.9118421052632
2017	608.9118421052632
2018	608.9118421052632
2019	609.2276315789474