Year	Percent
1991	8.522
1992	8.457
1993	8.931
1994	8.634
1995	7.15
1996	8.102
1997	5.466
1998	5.514
1999	6.758
2000	6.723
2001	6.783
2002	5.607
2003	5.19
2004	8.05
2005	6.344
2006	4.346
2007	4.156
2008	4.919
2009	5.057
2010	5.455
2011	5.462
2012	5.441
2013	5.327
2014	5.531
2015	5.734
2016	5.749
2017	5.896
2018	5.857
2019	5.847
2020	5.832
2021	5.824
2022	5.814