Year	days
2009	67.6
2010	67.1
2011	67.7741935483871
2012	67.58064516129032
2013	67.53818181818183
2014	67.87151515151515
2015	66.79606060606062
2016	67.3009090909091
2017	67.21000000000001
2018	66.72515151515152
2019	66.08878787878788