Year	Percent
1991	4.607
1992	4.416
1993	4.812
1994	4.72
1995	5.045
1996	5.188
1997	5.299
1998	5.262
1999	5.673
2000	5.511
2001	5.123
2002	5.06
2003	5.038
2004	4.726
2005	4.783
2006	4.729
2007	5.003
2008	4.369
2009	3.937
2010	4.135
2011	4.066
2012	4.021
2013	4.178
2014	4.332
2015	3.93
2016	3.803
2017	3.949
2018	3.885
2019	3.835
2020	3.792
2021	3.75
2022	3.707