Year	hours
2005	216.87
2006	209.66346153846155
2007	197.33636363636364
2008	196.25892857142858
2009	186.58928571428572
2010	182.32142857142858
2011	175.10344827586206
2012	164.53389830508473
2013	164.40322580645162
2014	162.70967741935485
2015	161.01612903225808
2016	160.2016129032258
2017	155.71693548387097
2018	152.94444444444446
2019	155.67460317460316