Year	Percent
1991	5.089
1992	5.097
1993	5.014
1994	4.991
1995	4.974
1996	4.96
1997	4.929
1998	4.921
1999	4.937
2000	5.069
2001	4.967
2002	4.982
2003	5.077
2004	8.672
2005	9.296
2006	9.685
2007	9.248
2008	9.732
2009	8.146
2010	8.653
2011	9.639
2012	9.414
2013	8.805
2014	8.374
2015	7.613
2016	7.256
2017	7.248
2018	7.246
2019	7.244
2020	7.24
2021	7.237
2022	7.234