Year	hours
2005	244.16666666666666
2006	240.16
2007	239.2
2008	233.2
2009	205.44
2010	200.76
2011	196.4
2012	193.8653846153846
2013	201.44827586206895
2014	198.06896551724137
2015	194.8793103448276
2016	182.70689655172413
2017	176.6206896551724
2018	171.17241379310346
2019	168.05172413793105