Year	Percent
1991	4.079
1992	4.345
1993	4.326
1994	4.982
1995	4.952
1996	4.901
1997	5.008
1998	5.058
1999	5.13
2000	5.049
2001	5.034
2002	4.994
2003	5
2004	4.957
2005	4.962
2006	4.998
2007	5.071
2008	5.15
2009	5.139
2010	5.192
2011	5.261
2012	5.362
2013	5.442
2014	5.493
2015	5.41
2016	5.271
2017	5.314
2018	5.335
2019	5.349
2020	5.35
2021	5.352
2022	5.33