Year	Percent
1991	4.841
1992	4.96
1993	4.751
1994	4.754
1995	4.621
1996	5.017
1997	5.101
1998	5.117
1999	5.438
2000	5.217
2001	5.14
2002	5.263
2003	5.222
2004	3.628
2005	2.736
2006	3.03
2007	3.491
2008	3.997
2009	4.568
2010	4.666
2011	4.785
2012	4.848
2013	3.517
2014	3.36
2015	3.323
2016	3.286
2017	3.232
2018	3.245
2019	3.237
2020	3.233
2021	3.221
2022	3.215