Year	hours
2005	160.1
2006	166.21875
2007	158.94117647058823
2008	159.3357142857143
2009	147.72142857142856
2010	147.0857142857143
2011	148.6216216216216
2012	151.27631578947367
2013	156.60526315789474
2014	157.46052631578948
2015	157.39473684210526
2016	158.55263157894737
2017	155.42631578947368
2018	152.52631578947367
2019	152.81578947368422