Year	hours
2005	301.9723926380368
2006	299.9580838323353
2007	291.8264705882353
2008	276.3827485380117
2009	263.02005813953485
2010	258.3854651162791
2011	253.13505747126436
2012	247.52808988764045
2013	260.99626984126985
2014	257.149708994709
2015	254.86796296296296
2016	243.7634656084656
2017	238.74865079365077
2018	235.04365789473684
2019	233.36444736842105