Year	years
2003	3.1230769230769235
2004	3.1230769230769235
2005	3.152941176470588
2006	3.152941176470588
2007	3.152941176470588
2008	3.152941176470588
2009	3.152941176470588
2010	3.152941176470588
2011	3.0764705882352943
2012	3.0764705882352943
2013	3.0052631578947366
2014	3.0052631578947366
2015	3.0052631578947366
2016	3.0052631578947366
2017	3.0052631578947366
2018	3.0052631578947366
2019	3.0052631578947366