Year	hours
2005	241.2058823529412
2006	232.54285714285714
2007	223.11428571428573
2008	214.2
2009	199.5142857142857
2010	192.05714285714285
2011	183.25714285714287
2012	172.9142857142857
2013	175.97368421052633
2014	173.42105263157896
2015	170.10526315789474
2016	165.52631578947367
2017	163.42763157894737
2018	164.06578947368422
2019	163.5921052631579