Year	hours
2005	330.5978260869565
2006	333.89130434782606
2007	332.35869565217394
2008	321.53695652173917
2009	301.51521739130436
2010	295.6586956521739
2011	292.6521739130435
2012	286.8829787234043
2013	290.6136274509804
2014	287.1822549019608
2015	286.1920588235294
2016	268.1440196078431
2017	261.0342156862745
2018	258.99009803921564
2019	256.0832352941176