Year	years
2003	3.4105263157894736
2004	3.34
2005	3.419047619047619
2006	3.419047619047619
2007	3.3545454545454545
2008	3.3545454545454545
2009	3.2956521739130435
2010	3.2956521739130435
2011	3.282608695652174
2012	3.3541666666666665
2013	3.2640000000000002
2014	3.2640000000000002
2015	3.2640000000000002
2016	3.2640000000000002
2017	3.2640000000000002
2018	3.2640000000000002
2019	3.2640000000000002