Year	hours
2005	291.89622641509436
2006	294.8301886792453
2007	286.3611111111111
2008	279.3833333333333
2009	266.47592592592594
2010	266.93148148148146
2011	265.85185185185185
2012	277.6517857142857
2013	282.3832786885246
2014	279.39147540983606
2015	277.76852459016396
2016	274.2037704918033
2017	268.71114754098363
2018	268.3873770491804
2019	270.73573770491805