Year	hours
2005	270.125
2006	255.52
2007	251.44
2008	242.1153846153846
2009	224
2010	214.5
2011	198.22222222222223
2012	185.5
2013	184.94444444444446
2014	181.27777777777777
2015	179.94444444444446
2016	175.12962962962962
2017	172.7314814814815
2018	174.5
2019	173.64814814814815