Year	hours
2005	352.5405405405405
2006	344.6842105263158
2007	342.57894736842104
2008	331.7631578947368
2009	324.5263157894737
2010	326.8157894736842
2011	328.80263157894734
2012	329.7368421052632
2013	328.35526315789474
2014	328.14473684210526
2015	326.7105263157895
2016	307.11842105263156
2017	304.5131578947368
2018	300.87631578947367
2019	301.39473684210526