Year	years
2003	3.3000000000000003
2004	3.3000000000000003
2005	3.0090909090909093
2006	3.0090909090909093
2007	3.0090909090909093
2008	3.0090909090909093
2009	3.0090909090909093
2010	3.0090909090909093
2011	3.0090909090909093
2012	2.8272727272727276
2013	2.7153846153846155
2014	2.715384615384615
2015	2.715384615384615
2016	2.715384615384615
2017	2.715384615384615
2018	2.715384615384615
2019	2.715384615384615