Year	hours
2005	282.52830188679246
2006	278.2962962962963
2007	272.7037037037037
2008	262.68518518518516
2009	250.78181818181818
2010	253.35090909090908
2011	254.51818181818183
2012	259.4298245614035
2013	264.2241379310345
2014	263.13793103448273
2015	262.8534482758621
2016	249.36206896551724
2017	247.27586206896552
2018	243.69482758620688
2019	244.36206896551724