Year	Percent
1991	8.922
1992	8.624
1993	8.672
1994	7.972
1995	6.54
1996	5.844
1997	5.224
1998	5.418
1999	4.966
2000	4.845
2001	5.04
2002	4.243
2003	4.415
2004	4.325
2005	4.482
2006	4.896
2007	4.668
2008	4.459
2009	4.897
2010	4.431
2011	4.057
2012	4.138
2013	4.425
2014	4.369
2015	4.643
2016	4.569
2017	4.837
2018	4.824
2019	4.817
2020	4.805
2021	4.797
2022	4.79