Year	Percent
1991	7.861
1992	7.837
1993	8.16
1994	7.744
1995	8.117
1996	8.201
1997	8.451
1998	8.128
1999	7.852
2000	7.934
2001	8.472
2002	9.01
2003	8.412
2004	6.724
2005	6.815
2006	7.138
2007	7.084
2008	7
2009	7.498
2010	7.73
2011	7.744
2012	7.711
2013	8.13
2014	8.691
2015	8.197
2016	6.255
2017	6.405
2018	6.451
2019	6.474
2020	6.511
2021	6.538
2022	6.571