Year	hours
2005	335.104
2006	335.96456692913387
2007	332.00787401574803
2008	312.865748031496
2009	298.538671875
2010	293.82265625
2011	289.79457364341084
2012	285.5189393939394
2013	302.2077659574468
2014	297.68294326241136
2015	295.0854255319149
2016	280.51627659574467
2017	274.4400354609929
2018	271.44535460992904
2019	267.74287234042555