Year	hours
2005	158.22222222222223
2006	158.22222222222223
2007	148.2
2008	150.575
2009	151.325
2010	151.4
2011	162
2012	161.27272727272728
2013	160.77272727272728
2014	162
2015	162
2016	177.9090909090909
2017	177.27272727272728
2018	172.63636363636363
2019	168.45454545454547