Year	Percent
2006	40.44134
2007	40.85182
2008	41.20284
2009	40.2241
2010	40.26526
2011	40.34073
2012	39.59067
2013	39.91768
2014	40.09147
2015	39.80105
2016	39.51521
2017	39.09216
2018	39.60668
2019	39.56094
2020	41.40802
2021	41.44369