Year	hours
2005	418.65
2006	405.85714285714283
2007	405.85714285714283
2008	400.6190476190476
2009	398.6190476190476
2010	399.4761904761905
2011	399.5
2012	398.5
2013	398.20068181818186
2014	398.8370454545455
2015	396.13250000000005
2016	365.7234090909091
2017	360.13022727272727
2018	360.53931818181815
2019	361.8575