Year	Percent
1991	6.572
1992	6.716
1993	7.418
1994	7.988
1995	6.901
1996	6.731
1997	6.622
1998	6.651
1999	6.444
2000	5.895
2001	5.8
2002	5.714
2003	5.449
2004	5.603
2005	5.795
2006	5.781
2007	5.842
2008	5.948
2009	6.248
2010	6.464
2011	6.031
2012	5.959
2013	6.25
2014	6.23
2015	6.253
2016	6.143
2017	6.122
2018	6.084
2019	6.069
2020	6.058
2021	6.047
2022	6.036