Year	hours
2005	317.8205128205128
2006	311.225
2007	303.675
2008	297.15
2009	272.675
2010	275.40749999999997
2011	277.7875
2012	277.48809523809524
2013	280.6279069767442
2014	280.4418604651163
2015	280.6046511627907
2016	264.6860465116279
2017	263.1511627906977
2018	261.6348837209302
2019	264.83720930232556