Year	Percent
1991	5.406
1992	5.401
1993	5.951
1994	5.535
1995	5.796
1996	5.913
1997	5.917
1998	5.602
1999	6.9
2000	6.229
2001	6.621
2002	6.533
2003	6.59
2004	6.205
2005	5.626
2006	5.125
2007	5.025
2008	5.789
2009	5.326
2010	5.326
2011	5.285
2012	5.145
2013	5.103
2014	5.034
2015	4.959
2016	4.895
2017	4.893
2018	4.854
2019	4.828
2020	4.796
2021	4.762
2022	4.727