Year	Percent
2006	6.65184
2007	6.22699
2008	6.21615
2009	5.44155
2010	5.36551
2011	4.98147
2012	4.83535
2013	4.81444
2014	4.56542
2015	4.42428
2016	4.35384
2017	4.31847
2018	4.33504
2019	4.10891
2020	4.4261