Year	days
2003	51.51044776119404
2004	48.461111111111116
2005	50.72024539877302
2006	47.8437125748503
2007	43.311764705882354
2008	39.946783625730994
2009	37.728488372093025
2010	35.93779069767442
2011	31.874712643678166
2012	31.35786516853933
2013	26.779365079365082
2014	24.300529100529108
2015	23.404736842105265
2016	23.006315789473682
2017	21.495789473684216
2018	20.501047120418846
2019	19.598429319371725