Year	days
2009	68.89285714285714
2010	68.35714285714286
2011	69.03448275862068
2012	68.82758620689656
2013	68.70193548387097
2014	69.05677419354839
2015	67.91193548387098
2016	68.44935483870968
2017	68.3525806451613
2018	67.83645161290323
2019	67.15903225806453