Year	Percent
1991	5.756
1992	6.36
1993	8.185
1994	11.398
1995	10.828
1996	13.556
1997	8.631
1998	8.299
1999	7.922
2000	9.288
2001	8.108
2002	7.857
2003	7.297
2004	8.222
2005	8.851
2006	8.185
2007	8.169
2008	7.253
2009	5.247
2010	5.06
2011	4.172
2012	4.989
2013	2.594
2014	4.889
2015	8.305
2016	8.265
2017	8.268
2018	7.981
2019	7.731
2020	7.499
2021	7.298
2022	7.079