Year	hours
2005	340.72727272727275
2006	326.72727272727275
2007	323.8181818181818
2008	322.90909090909093
2009	285.8181818181818
2010	273.72727272727275
2011	257.3636363636364
2012	233
2013	231.54545454545453
2014	225.72727272727272
2015	223.0909090909091
2016	218.95454545454547
2017	213.25
2018	218.6818181818182
2019	217.22727272727272