Year	Percent
1990	4.44
1991	4.49
1992	4.5
1993	4.38
1994	4.26
1995	4.27
1996	4.35
1997	4.34
1998	4.34
1999	4.39
2000	4.36
2001	4.61
2002	4.97
2003	5.11
2004	5.07
2005	4.94
2006	4.82
2007	4.68
2008	4.87
2009	5.19
2010	5.13
2011	4.91
2012	4.96
2013	4.97
2014	4.97
2015	5
2016	5.07
2017	5.14
2018	5.19
2019	5.25