Year	hours
2005	338.89285714285717
2006	340.82142857142856
2007	331.32142857142856
2008	328.38392857142856
2009	319.79464285714283
2010	320.14285714285717
2011	315.2758620689655
2012	303.86206896551727
2013	376.51612903225805
2014	373.43548387096774
2015	369.11290322580646
2016	346.46774193548384
2017	337.1290322580645
2018	336.11290322580646
2019	324.85483870967744