Year	hours
2005	500.9
2006	504.15625
2007	499.71875
2008	389.10625
2009	362.7176470588235
2010	337.52941176470586
2011	324.1764705882353
2012	275.8235294117647
2013	266.7647058823529
2014	254.88235294117646
2015	252.60294117647058
2016	237.38235294117646
2017	232.85294117647058
2018	222.26470588235293
2019	221.26470588235293