Year	days
2003	646.625
2004	633.84
2005	656
2006	649.6379310344828
2007	649.9137931034483
2008	653.6034482758621
2009	647.2758620689655
2010	645.448275862069
2011	662.9322033898305
2012	668.7
2013	675.7181818181818
2014	676.1727272727273
2015	678.869696969697
2016	680.4106060606061
2017	677.0045454545455
2018	676.5651515151516
2019	676.5500000000001