Year	Percent
1991	6.824
1992	6.298
1993	6.313
1994	6.041
1995	5.727
1996	5.648
1997	5.453
1998	5.308
1999	5.078
2000	5.926
2001	5.469
2002	6.002
2003	6.143
2004	5.892
2005	5.651
2006	5.266
2007	5.916
2008	5.437
2009	4.707
2010	4.874
2011	5.051
2012	3.798
2013	4.3
2014	6.494
2015	5.672
2016	5.361
2017	5.218
2018	5.122
2019	5.054
2020	4.987
2021	4.924
2022	4.87