Year	Percent
1996	5.35
1997	5.67
1998	5.36
2006	4.57
2007	4.8
2009	5.53
2010	3.86
2011	3.55
2012	2.86
2013	2.7
2014	3.05
2015	3.1
2016	3.44
2017	3.37
2018	3.16
2019	3.25
2020	0.03